Supernatural (TV series)/Recap/S03/E12 Jus in Bello

Season 3, Episode 12:

Jus In Bello
Captured by FBI agent Victor Henricksen, the Winchesters find themselves in a siege when the police station is surrounded by demons.

Tropes

 * Did Not Do the Research: The episode's title translates best as "Justice in War". If what they wanted was "The Laws of War" (as stated a couple of times by Ruby), they should have called it "Lex Bellorum".
 * Virgin Sacrifice: Ruby proposes a demon-killing spell that requires the death of a virgin.
 * Wham Line