Scott is dragged onto the dance floor by Kate and starts dancing. He really does try to make Jan's body look good while dancing.
Try, of course, being the key word here. Before Scott spent entirely too much time inside under house arrest learning how to moonwalk under the tutelage of various Youtube walkthrough videos, he acquired most of his dance moves watching a copious number of KC and the Sunshine Band and Wham! music videos on MTV.
And it shows in his moves on the dance floor.
Fortunately, Kate doesn't appear to be paying much attention to him.
This, however, doesn't stop him from paying attention to her. And yeah, at first, it's out of concern that her eyelids fluttering shut were a precursor to a fainting spell that would result in him forcibly dragging her off the dance floor. But once that passed and he was assured she wasn't drunk enough to require an Uber, stat, his eyes focused on other things.
Like the soft, relaxed curve of her lips. Or her eyebrows. Women had the best eyebrows. Scott had no idea how they did them. Or her nose. Even her nose was great. You couldn't really tell a woman they had a great nose, but Scott really thought she did.