Derek dying has something to do with it, but on a whole, Stiles is just a bit tired, this week. Especially after the debacle with the Gods, he feels like he's hit a brick wall. It's frustrating, and he doesn't want to take that out on Derek. He's just--he's just happy that Derek's alive, at all, and still here. With Isaac leaving, Scott disappearing, Stiles had been half worried that Derek wouldn't come back at all, either.

At least he's been proven wrong with that. At the mention of the notes, Stiles blinks, shaking his head. "Shit--I forgot. I'll do that today." Of course he forgot; his memory is shit lately, and with the mess of zombies the last week, it slipped his mind. Doesn't mean he's not annoyed at himself.