[He can only barely see what Stiles is actually got in his hands there (and wouldn't know it well even if he could see it lbr), but it sounds like an action of distress so much that he can't help but ask.
He's making some light with his artes, but it's not much either. Not more than the wall that currently reads fun ones like Magic destroyed my family, and me or maybe something even more ironic - Whenever there is danger, he feels useless.] ... It doesn't seem like much is going to work.