"Hey, hey! Whose side are you on, anyway!?" he squawks at Derek, pointing a finger at him. Welp, this has turned into a total cluster fuck. Of course it has, Stiles is involved.

But then he turns back to Batman, frowning now, forgetting his need to recognize the face without the cowl. Not now, not when he has to defend his actions suddenly, damn it.

"Oh? So you trained me to let innocent bystanders get the crap beaten out of them? I don't remember that part of the syllabus, Mr. Miyagi! I can't just stand by when somebody was about to get a WWE level smack-down. I didn't know it was you! You said, we don't kill! Right? So part of that is not letting people get killed. Even if they're completely stubborn assholes wearing really bad fake mustaches."