If you don't declare a rule against it, it's fair game, or so he would tell Tamaki had he been given the time to complain at all. As it is, there is none, and Childermass is equally surprised that Tamaki manages to be stronger than he looks. It isn't that surprise that gives him an edge, however, and the struggle goes on long enough before Tamaki slams the magician's hand down on the tabletop.

He ends up leaning back in his seat and raising his eyebrows at where his hand has ended, then gives a faintly amused huff.

"So you did, Tamaki." From there, he looks back up again, right at the teen. "And I told you, that isn't my name."