He's more intrigued than surprised. Different timelines and universes? This was the first he'd heard of such an idea, and frankly it sounded a little farfetched. He wanted to ask if that was something a lot of people believed in around here, but the music was still too loud; he'd save the question for later, when he'd had time to think on the proper Bruce Wayne reaction to it.
Bruce moves into a space, and it's not far from there to surprisingly good moves on the dancefloor.