She's allowed her reactions, because nothing about this is pleasant. If Clint noticed her wince, he doesn't comment on it, just waiting for her agreement or disagreement.

"Nah, doesn't have to be. It's not going to be anyway, so..." He attempts a shrug, but it's made difficult by the placement of the hooks. "Just don't go for the face."

Now he's smirking as best as he can, because the tension is already too thick for his liking, and while he might not be able to break it completely, at least he can try.