As the music starts up, Strange leads Rita into a dance. This is a full tilt waltz as he moves all around the room, moving them in a circle, occasionally twirling as they move. Strange may be a whiner of a man who's absolutely abysmal at physical contact, but with this? He's moving expertly. Even if Rita steps on his feet or stumbles a bit, Strange manages to keep moving and keep to the rhythm and continue to drag her along the dance floor.

Somebody put plenty of points into posh nonsense.

He doesn't let go of Rita until the song ends, at which point Strange steps away, and gives her a bow. Just ignore the fact that he looks amazingly smug right now.