That's not an expected reaction. Usually grabbing someone like that gets surprise or fear. Maybe anger, trying to struggle or lash back out at it. This is too cool, and that more than anything is what makes him pause. Much as he really doesn't care about rules, he doesn't have enough of an idea of how anything works here to know what the consequences might be. He'll back off. For now. Though the look on his face is challenging, if anything.

"So? What happens if people break rules?" And almost as an afterthought, "Shouldn't you tell people what the rules are in the first place?"