The expression on Levi's face is vaguely predatory, now. Clubs and bars are usually where he picks up his meals, and so dancing puts him in an instinctive hunting mood. And for Levi, hunting is a sort of sexual experience-- it's something about feeding, about blood flowing through him and... well, it would sound odd to others, but it's all linked together.

Besides, Godric can dance, and Levi is totally amused by that. He's also dancing pretty close, letting himself get lost in the music.