"Normally I'd say I'm not going to arrest you for it, but..."

A little late for that. Nick has to think about that for a moment, because he does want to prepare the guy as much as possible, he just... doesn't know exactly what to prepare him for.

"You can tell me your name, actually, since I should have asked you that before instead of explaining the situation and telling you my not-quite James Bond level plan. And whatever Detective Sherman is, it's not human. Just - keep that in mind, I guess."