Flirting was fun, and for him, as much a reflex as anything. So was physical contact, and if they danced a little close, well, none of the press would be at all surprised; he'd been photographed doing far worse. There was enough of a crowd to keep him honest, as was the fact that this was Bruce's event, and for once in his life (well, more often than that, in recent years) he wanted to be sure that the focus was off him and on the right place.
But this wasn't, and so he relaxed and guided her more or less in time with the music - mathematical genius did not translate into musical genius with him, all theories notwithstanding. "How many of them keep thinking they're the ones leading?" he had to ask.