Once, the Doctor would have thought that a dance would hurt someone, but that was before Rose, and before he remembered that he could, in fact, dance. And when someone grabbed his hand, for just a second, an image of Rose flashed into his head. But it was only for a second, because he realized quite quickly that an equally familiar face was there in front of him.

"Are you sure about that?" Even though he knows full well that he can dance, he can't resist playing the hesitant and reluctant cards.