The Law of Diminishing Defensive Effort

""You don't know what you're talking about! Dodging an attack is nothing more than a fighting instinct. It's a natural reaction developed from years of hand-to-hand combat, but it changes nothing: No matter what you do your sword can not cut me!""

- Nnoitra Gilga, Bleach

The less actively a combatant pursues his own defense in a fight, the less likely he needs to.

The corollary: Any attack that forces someone who normally ignores self-defense to dodge the attack is an attack that can kill him in one hit.

Frequently seen in Implacable superheroes/villains and Big Bads trying to make an impression.

Although there are some real-life examples, attempting to use this in Real Life is more likely to cause quick and stupid deaths. It just doesn't work if you do it on purpose.

The sad (terrifying) fact is that this is an instinctive response called The Peltzman effect, where the person will take more risks according to how safe he is in some kind of internal (insane) sense of balance. But since humans tend normally to overestimate their benefits... well. Worse is that it's a constant effect that people do without realizing day after day. Not so different from pain tolerance; expected pain "hurts" less than surprise pain.

Compare Punch Punch Punch Uh Oh. See also Good Thing You Can Heal. A Not So Invincible After All moment usually occurs when said character bumps into the thing that poses a genuine threat.

Anime and Manga
"Raditz: Goodness! You've managed to singe some of my leg hairs."
 * Very common in the Dragonball franchise, whether between one of the ridiculously powerful main characters and an ordinary human, or by a villain to show how far above the hero they are. As early as the second episode of DBZ, Raditz makes light of Piccolo's power, stands there and allows himself to be blasted, and when the smoke clears...


 * Maybe that wouldn't happen if he wore pants!
 * This actually backfires on Cell who, after taking the typical stand-there-and-take-it defense, is quite surprised and upset when Vegeta manages to blow off his arm. However, after he gets over his (genuine) shock, he quickly grows it back.
 * He did move to the side at the last minute, though. By the way he's standing, you can tell it was aimed at the center of his chest.
 * It still fits though, since he was fully expecting to do this but at the last second realized it would kill him (hence the "Oh crap!" face, and even famously saying "oh shit!" in the German dub) and dodged it the best he could.
 * Kenpachi Zaraki from Bleach. He's perfectly content to let his opponents attack him, and actually encourages them to go for the eye or the throat. The first time Ichigo tried to hit Kenpachi with his sword, Ken was unharmed, and Ichigo's hands got hurt from the impact.
 * Also, Nnoitra Jiruga fits it pretty well, especially the corollary during his fight with Kenpachi. He doesn't actually dodge any of Kenpachi's attacks until Kenpachi aims for the head, giving Kenpachi the proof he needs that Nnoitra's hierro isn't actually invincible.
 * averts this for a while, using his illusions to avoid attacks he could probably easily tank anyway. But when he reveals, he adheres fully to this trope.
 * In Magical Girl Lyrical Nanoha, during Fate and Signum's first battle, Signum calmly put a barrier around her and just stood there with her eyes closed as Fate launched Photon Lancer. The energy missiles just bounced off of her. Later in the battle, when Fate charged at Signum with her axe, Signum actively dodged it. In the next episode, it's revealed that Fate had managed to wound her then.
 * Averted with Reinforce (Eins), who isn't averse to using external barriers to stop her opponents' attacks. It makes things all the more Awesome when
 * In StrikerS, Fate develops a "defensive costume" that trades all protection for a massive speed boost. The Numbers' best fighter immediately recognizes that a single hit that connects will kill Fate. What she fails to realize is that in a high-speed battle, you CAN'T land a hit on Fate.
 * Yuuno was good at two things, barriers and teleportation. When he's seen fighting Vita in the second episode of As he nearly completely ignores her, throws up a defensive barrier, and keeps working on teleporting the entire gang out of the Wolkenritter's barrier. This ALL WITHOUT THE USE OF A MAGICAL DEVICE. Vita had demoloished Nanoha and would have won if the others hadn't interfered just the episode before.
 * Alucard from Hellsing, not because he can't be damaged (rather the opposite, really) but because he heals so fast and is practically unkillable. He likely also doesn't because it's as scary as hell for those attacking him with absolutely no clear actual permanent effect. When he begins employing anything approaching tactics, you can tell the fight is very serious.
 * Conditional immortality.
 * Hidan in Naruto is entirely immortal, and thus has almost no strategy or moves beyond "get opponent's blood for voodoo technique". Both his partner Kakuzu and eventual opponent Shikamaru tell him how stupid that is. Again, Conditional Immortality like with Alucard. Word of God says that, if he doesn't perform his ritual sacrifices, his immortality will eventually run out. No word on how long that TAKES, though.
 * The series is otherwise an aversion, as it's shown that even with heavy use of Charles Atlas Superpower there's a limit to the raw physical ability any person can normally achieve (as detailed in this helpful essay). Thus, even insanely powerful ninja have to avoid simple things like kunai and explosives and the strongest techniques are the ones that make being hit nearly impossible.
 * Hidan DOES have to dodge or avoid certain things though, since
 * Some ninja, like Orochimaru, still play the trope straight though. In Orochimaru's case, he can simply regenerate after almost anything including a broken neck.
 * Orochimaru also plays it entirely straight when
 * Suigetsu partially averts this though as despite being able to avoid damage by turning into water, he still prefers to avoid attacks in a more conventional fashion (except in that one filler episode, but that was against someone he really didn't consider a threat and to scare him by showing the power off). Granted, this might simply be because he can't attack while reforming or a limit on how much he can regenerate before losing consciousness/dying.
 * Subverted with both Gaara and later who tried to rely on their "ultimate defense" (the Sand Shield and ) technique to mean they don't need to do anything else to defend themselves, but eventually have both of them defeated.
 * Played straight with a twist in Blade of the Immortal, as the main character, the titular immortal swordsman Manji, is bothered by the fact that his reliance on his regeneration induced immortality means that, consequently, his sword skills are slipping.
 * Subverted in Tengen Toppa Gurren Lagann: Simon puts up a barrier of Spiral power that effortlessly deflects a barrage of Anti-Spiral attacks. He mocks the Anti-Spirals when they immediately try another barrage - but this one penetrates the barrier and causes serious damage.
 * This is an example of of the Anti-Spirals rewriting the laws of the universe, basically, to make "the impossible possible."
 * Justified in Rurouni Kenshin, where Kenshin's best Hiten Mitsurugi Ryu moves have two parts, greatly reducing blind spots and successful counterattacks.
 * In Slayers, to demoralize Lina into using her Dangerous Forbidden Technique, Hellmaster tells the Slayers that they can attack him all they want and he won't counter-attack or even attempt to defend himself, and then spends a while laughing off everything they throw at him (even more so in the novel version, where all of the Slayers actively participate in the fight). The first thing that forces him to react is two simultaneous Dragon Slaves from Lina and Sylphiel, which "might have hurt a bit if I hadn't dodged it". The only thing that he really considers worth defending against is the Giga Slave - at which point he discovers that ultimate destructive power is not a toy.
 * Averted in Black Butler, where Sebastian regularly dodges when shot at despite being Immune to Bullets. This is suggested to be because getting shot ruins his clothes, and as a Battle Butler he must look impeccable.
 * from Fullmetal Alchemist can do pretty much the strongest alchemy in the entire series without moving at all.
 * Accelerator from To Aru Majutsu no Index has control over vectors, so anything that makes contact with him will bounce off, even if it hits him without him being aware of it. His arrogance bites him in the ass in his fights against Touma and Amata Kihara.
 * As a testament to Accelerator's Character Development, much later in the series, he faces Umidori Kuroyoru. Kuroyoru launches an attack that can hurt him, expecting Accelerator to take the attack and get himself killed. Accelerator dodges, causing her to have a Villainous Breakdown as she didn't see that coming.
 * In Fist of the North Star, Souther's Nanto Ho'oh Ken has no defensive stance. In the initial fight against Kenshiro, he manages to No Sell every technique Kenshiro uses (due to having every pressure point on his body reversed due to his heart being on the opposite side.
 * Juvia from Fairy Tail has a body of living water that normally feels no pain and can effortlessly re-from when splattered. When Meldy throws a Storm of Blades at her, Juvia confidently stands still, but they turn out to be magical swords that can hurt her, and she gets badly injured.
 * Totally averted in Chapter 280 of Kenichi the Mightiest Disciple. The Karate club is taught Muy Thai by one of the members of Yomi, but he only taught them how to attack. As such they could not defend against Kenichi at all when he counter attacked

Comic Books

 * Superman in, well, just about anything he shows up in. This was lampshaded in the DCAU by Batman, who realized that Superman is so powerful he probably doesn't need to fight strategically most of the time.
 * In the DCU proper, kryptonite-tipped bullets have been used several times against Superman for that very reason. While he could very easily dodge a bullet, he's simply got no reason to and will therefore stand there and let you shoot him. Get a bullet that hurts him, and this backfires against Big Blue rather badly. But then, Superman being the kind of person he is, he's likely tanking the bullets just to protect any innocent bystanders nearby.
 * Lampshaded by Jerry Seinfeld in a American Express TV commercial with an animated Superman. Instead of catching a VCR thrown at him, Superman just puts his hands on his hips and thrusts out his chest. Jerry asks him why didn't he just catch it (to prevent it from breaking) and Superman replies that he doesn't catch, he does the chest thrust.
 * Lampshaded in the recent Superman Returns movie, where Supes wins a "fight" with some bank robbers merely by showing up.
 * Clark in Lois and Clark was supremely bad about this, in a show where the number of laser guns and other Mad Scientist inventions outnumbered the Kryptonite chunks, Superman would just stare at the bad guy's gun pointed at him instead of dodging it or using his heat vision to melt it away.
 * Adam Destine (Clan Destine, Marvel) can't be harmed, period. As he has lived several centuries with this condition, he is tends not to react to any attack. His usual tactic is to stand still while his opponent gets tired or leaves.
 * Kimura is indestructible, so she doesn't even flinch when a gun is pointed that her head, or when faced with X-23's adamantium claws. Her arrogance bites her in the ass when she faces Emma Frost.

Fan Works

 * Paul in With Strings Attached. Given that the super-strong Paul has absolutely no interest in hitting anyone (unless one of the others is threatened) and no combat training whatsoever, he has no moves at all in case something penetrates his invulnerability, as with the wraiths or the Hunter's BFS.

Film
""Sounds like we're winning, sir.""
 * In The Court Jester, when, it's shown by him effortlessly parrying the villain's attacks while pouring and drinking a cup of water.
 * Robin Hood in Mel Brooks' Robin Hood: Men in Tights does something similar, having a nonchalant conversation with his servant while fighting the guards.
 * His blind servant, arriving in the middle of the fray to deliver Robin a beer, who drinks it in one hand while fighting mooks off with the other.


 * The Cobra gunship from G.I. Joe: The Rise of Cobra lets anti-aircraft 50 cal bounce off its armored shell, but actively engages incoming missiles.
 * In Ip Man 2, the Twister asks Master Hung's students to hit him as hard as they can and laughs off their blows as wimpy. When he actually throws down with Master Hung and Ip, though, he properly blocks and evades their attacks.
 * In The Matrix Neo becomes so masterful over Agent Smith that he can fight him off with only one hand. In the sequel, when an Agent almost lands a blow, which Neo blocks before very casually saying, "Hmm. Upgrades."

Literature

 * Invoked in the Dale Brown novel Wings of Fire, where Hal tells a Night Stalker new to the Tin Man Powered Armor to stop being obsessed with taking cover like a conventional foot mobile and focus on getting the job done while letting the suit's protection shrug off small-arms fire.
 * Beowulf has the titular hero starting out battling a monster naked--but by the time the dragon comes around, he's an old man and prudently equips himself with chain mail and a shield.
 * In The Dresden Files, Ivy the Archive is a Library of Babel in human form. She knows everything that has ever been written down. And in the Dresdenverse, knowledge equals power, and she has a lot of it. In a spectacular display of power, she manages to take on a bunch of very Elite Mooks, she can focus on both offensive and defensive magics at the same time. But when the leader of the Elite Mooks throws a spell at her, Ivy puts her whole attention (as well as both of her hands) on her defense and counterspells.

Live Action TV
"Q: "Understand you"? You're nothing to him."
 * Glory in Buffy the Vampire Slayer rarely had to defend herself against anything, even when Uber-Willow was slinging major mojo her way.
 * Buffy the Vampire Slayer's Big Bad of Season 3, Mayor Richard Wilkins III, never lifts a finger to defend himself until he gets Scaled Up. Of course, by then it's a bit late.
 * In Band of Brothers, the more time soldiers spend trying desperately not to die, the more likely they are to get killed, while those who simply focus on completing their mission tend to do rather better. As in the case of Lt., later Captain Speirs, who runs through occupied Foy to link up with another company assaulting Foy from the other direction, then runs back through in order to lead his own men into the now-coordinated attack.
 * This is a Borg policy in Star Trek, as they will ignore anything they do not perceive as a threat. The very first drone to appear on the Enterprise makes a point of this, as it ignores not only Picard's attempts to communicate, but a low-level phaser blast.


 * Since individual drones are just about as important to the Borg as individual cells are to humans, this does make some sense. Much less in the later incarnations, where the Borg are starting to resemble zombies lead by a quite individualistic queen. Especially since Star Fleet members have on multiple occasions taken advantage of the drones ignoring them to seriously sabotage their efforts.
 * Of course, since the Borg's hat is adapting to what's hurt them, one can take this as the Borg adapting to Star Fleet exploiting the drones.
 * In the first season of Heroes, the show's supervillain Sylar would use his telekinesis as a passive forcefield to blunt the impact of surprise bullet hits, and could even stop bullets in mid-air Neo-style if given enough time to actually react. After he absorbed a Healing Factor in the later seasons, though, he just stopped bothering and let himself get riddled with holes even though doing so clearly inconvenienced him much more than simply stopping the bullets with telekinesis.
 * It kind of makes sense, though. If he uses telekinesis, they'll keep shooting, hoping he slips up once. If he doesn't try to stop the bullets, then they're more likely to stop shooting, since there's clearly no point.

Tabletop Games

 * Averted in go (a.k.a. igo, weiqi, baduk) - if the stronger player can forget defense, the handicap is too small - and according to the game etiquette, they should play weaker in order to avoid crushing their opponent. Especially if the handicap was purposefully omitted or too small. The stronger one is supposed to "gently" show where a mistake was done, and not take too great advantage of obvious blunders. It's supposed to be a sign of a good player that they can defeat a weak player of any level by a small margin.
 * The fluff of Vampire: The Masquerade mentions that Ventrue with the Fortitude discipline often like to use their supernatural toughness as an intimidation tactic, standing still and letting Muggles throw away bullets, knives and other attacks at them (which they shrug off) as a way of psyching them out.

Video Games

 * Pokémon Ruby and Sapphire has Shedinja. Shedinja has an ability called Wonder Guard, which makes it impervious to all attacks that its type combination isn't weak to. It also has only 1 HP, so any attack that isn't stopped by Wonder Guard, including any environmental effects or status effects, will knock it out.
 * Shining Force 2 has Kiwi, who starts off this way. He will take 1 damage from any attack (except magic and exceptionally strong enemies), but he only starts with 8 HP, and doesn't get much better. The main problem with his is the fact that the farther in the game you get, the more magic the enemies cast on him and his term of "exceptionally strong" gets looser and looser. He usually finished off the game with approx. equal defense as everyone else, but only half (if not less) the HP.
 * Berserker from Fate Stay Night is big on this trope. Attacks beneath 'A'-rank cannot hurt him at all . Thus, any attack Berserker will even deign to defend against will be one capable of mortally wounding him: It therefore becomes noticeable when he is actually forced to go on the defensive, especially in the anime
 * Although, Archer's involvement up to that point in the game route that the series of mainly based on is due to Saber having injured him.
 * Dante from Devil May Cry, at least in cutscenes, he will let enemies impale him with pointy objects, crush him underneath them etc. because of his Healing Factor, usually leaving a wisecrack or two. If he starts blocking or evading properly then you know the fight's serious.
 * The actual gameplay also demonstrates the corollary very well, especially on the harder difficulty modes: If you aren't jumping around like a frog on meth, you will be torn to shreds by most of the enemies you face.
 * In Mass Effect 2, when Harbinger takes control of a Collector, he makes absolutely no effort to hide or avoid taking damage. The Collector he takes over stands out in the open behind intensely powerful barrier and armor protection and keeps pounding Shepard's squad, ignoring gunfire, tech attacks, and biotics until his armor and shields have been completely depleted. Then he takes control of the next Collector in line. He even lampshades how little he cares that you're blasting away at him, calling your attacks "insults." At the end of the Suicide Mission, he, implying that such a thing might have actually hurt Harbinger himself.
 * The death of a host body was shown to weaken or distract Sovereign in Mass Effect 1. One can assume Harbinger left prior to the deaths, or that this is phenomenon is why Harbinger has a brief lag between possessions.

Web Comics

 * El Goonish Shive has Vlad showing this trope off here.
 * Damien never bothered even learning how to fight offensively, much less defensively.

Real Life

 * Probably the most well known real life example of this trope would be during the 'Rumble In The Jungle', the fight between George Foreman and Mohammed Ali in 1974. Foreman had knocked out almost every opponent within three rounds, which Ali capitalized on by taunting him and giving him the opportunity to take easy but ineffective body shot. Eventually, Foreman ran out of steam and Ali finished him. Ali had beaten one of the hardest punchers of all time by letting Foreman punch him until he could punch no more.
 * When full plate armour came into vogue it was largely proof against most of the infantry weapons of the day. Wearers generally had to cripple their opponents by crushing joints with warhammers or basically wrestle them to the ground and stab through the weak points with a broad bladed dagger or half-sword technique. Trying to kill a knight by swinging a sword at him was totally futile; he could ignore all your attacks and settle down to killing you in the most appropriate fashion. Note that this includes early firearms.
 * Contrast its main predecessor, chainmail. This was heavy and bulky and inconvenient to wear, especially when backed with enough padding to absorb the impacts of weapon blows. Powerful piercing attacks from swords, lances or arrows could penetrate mail to the detriment of its wearer.
 * To elaborate, slashing weapons (curved blades, in other words) were almost completely ineffective against chain mail. Up to and generally including the katana. One can actually track the evolution of weapons and armor side by side like this, as cloth or leather armor folded pretty quickly against a slashing weapon. Straighter weapons become more popular as sturdier armor was developed.
 * A lot of old suits of armor made knights have that funny pointed pot-bellied look. Unless a stab is perpendicular to the slope of the breastplate, it would tend to deflect off to the side instead of puncturing, and naturally a conic form makes determining the angle to stab much harder in the heat of combat. Naturally, you rarely if ever see it in mass media, due to Rule of Glamorous.
 * The modern counterpart of the armour knight is of course the battle tank. They were all but indestructible when first used, rolling through an entrenched battlefield quite immune to the machineguns which ruled the battlefield previously. Even now, you have to hit armoured vehicles with serious amounts of firepower to halt them in their tracks.
 * Not true; even the smallest artillery pieces in WWI had no trouble penetrating the light armor available at the time. (A British Mark IV, one of the more successful tanks of the war, had 105 horsepower. Even by the standards of the day it was severely underpowered. Compare to a modern M1 with 1500 horsepower.)
 * Actually, the early tanks (those in WW 1) were big, slow, overcrowded, and lightly armoured. The fact that they weren't slaughtered wholesale was because the artillery upset the enemy's field-gun positions (field guns are flat-trajectory artillery pieces with 75+ mm calibres, great for anti-tank work). And while modern armour has improved considerably, so have modern weapons, to the point at which even modern tanks (like Challenger 2s and M1 Abrams) aren't proof against modern, man-portable atni-tank weapons like the RPG-29.
 * Going back even further, ironclad warships brought the same defensive powers to naval warfare, with cannonballs simply bouncing off their armour plates. Since they were armed with those same weapons, the first few duels between these ships were all draws.
 * This is at least partly the point of the Bando Monk system of self defense (Burma?) where their goal if attacked is to dodge and parry until their attacker gives up in frustration. Then they wish him or her a nice day and go about their business. Yes, it's active defense, but the intention is to frustrate the attacker into submission.
 * People will often start off following all safety protocol and then after time, pay less and less heed to it. This comes from people relaxing because the dangers that the safety protocol prevents doesn't happen often. Then the disaster happens and people get hurt.
 * Can also be somewhat true in real sparring and fighting situations by attacking overwhelmingly enough that the opponent goes entirely on the defensive. You don't have to defend yourself if the opponent is too busy ducking and dodging to fight back.
 * Better hope your opponent is weak in defense, though, since attacking takes far more effort. If you don't win before you tire, you're at his mercy.
 * Indeed as this counter-strategy is the entire point of the rope-a-dope defense (and similar ones) where you let someone tire themselves out from attacking. And then while they're exhausted, you unload on them. The problem is that if your opponent knows what he's doing, and is fighting aggressively enough, you won't be able defend against all of his blows. Attacking may be more exhausting than defending, but a well preformed attack will usually still break through via proper use of feigns, sheer speed, and the fact that once you take just one good hit, your reaction time goes to hell, making it harder to keep on defending. This is why defense in a close combat situation is usually a temporary measure used to launch a counterattack from rather than anything you want to keep on doing for an extended period.
 * Completely averted in fencing, where an attack must be stopped or avoided before a counterattack is considered valid. Were the swords sharp, failing to defend before counterattacking would result in punctures of various vital organs, especially the lungs. Epee, which is based on a duel to first blood with less lethal weapons, is an exception.
 * Played with by some actual Western martial arts, such as the Liechtenauer tradition of German longsword, which advocate combining attack and defense in the same movements. One literally defended himself in such a way that his defense also attacked his opponent, or attacked in a manner which also covered himself against a potential counter-attack.
 * Real-life Nonchalant Dodge master Anderson Silva does this often when matched against inferior opponents, before effortlessly KOing them. See the bottom of that page for details. It was a huge shock when Chael Sonnen forced Silva to fight, and fight hard to win in their UFC 117 matchup.