Teen Wolf, Stiles, Peter, Major Character Deaths, First Season

STILES: Good luck getting a signal down here.
STILES: Oh… MiFi…
STILES: And you’re a Mac guy! Does that go for all Werewolves, or just a personal preference?
PETER: Turn it on. Get connected.
STILES: You know, you’re really killing the whole Werewolf-mystique thing here.
STILES: [sighing] Look, you still need Scott’s username and password, and I’m sorry, but I don’t know them.
PETER: [pointedly] You know both of them.
STILES: No, I don’t.
PETER: Even if I couldn’t hear your heartbeat, I would still be able to tell that you’re lying.
STILES: Dude, I swear to God–
PETER: I can be very persuasive, Stiles. Don’t make me persuade you.

Stiles was a geek. Ok, Stiles was really a geek, and had Deaton get him a soft gel with mountain ash he could hide in his mouth to repeat the scene with Atrades vs Harkonen only planned.
He was faced in his own Kobayashi Maru No Win situation and so he was taking the players out of the game and relaxed in capitulation while moving the gel to where he could bite on it and hold his breath.

Peter released him, he stood, straightened his clothes, and turned. And blew the full gel capsule straight in Peters face. Killing both of them instantly.

Stiles last thoughts as he died were “take that you mother fucker.”