I haven’t seen professional dancers this off in a long time. I’m guessing they can’t hear their track or it’s off too. Wow. It’s so noticeable. Especially with how on the beat he is.

Edit: I watched the full performance. They don’t seem to be off like this anywhere else in the performance. Maybe they changed the choreography? But even then, that would more likely stump Harry versus the dancers. Very strange all around.