The Doctor didn't dance, that much was a fact. He was tall and lanky, and the movement just didn't occur naturally. Though Rose had coaxed him out of his shell, (moreso in his last regeneration than current), he hadn't come to this dance with said intention. Mostly it was to socialize.
Finding a mixed drink with a hint of a smell from an apple, the Doctor spotted Jack just on the edge of the dance floor and quickly catches up to him.