Oh, he wants to answer that and the look on his face says he wants to answer that question. But before he can even get the question out, she's already moving on and asking that one single thing that he hates to answer because he's not getting that answer.

Of course, she's going to ask. He only looks like he's lost a knife fight, which isn't totally untrue. He doesn't look down at himself because he knows what she sees. So, he limps past her, totally ignoring the question. Maybe the next building has something he can change into or use to clean up with. At least enough that the next person who sees him doesn't ask.

But he still manages a grunt as he passes her by.