"Right! Yes," he places his hands at either side of Grantaire's hips and leads him so they're a bit more centered in the room. "Okay, I'm going to show you how to do this-" and he demonstrates a move where his hips seem to shimmy up and down all on their own, the rest of his body seeming not to move at all while this is going on. "So -- ah, bend your knees."