The Joker lands back on the sidewalk, sitting, and glares up at both of them. "OW! I was HELPING!" Not that Xellos needed his help, obviously. But it was the thought that counted, wasn't it?
He gets back up, rubbing his backside, and then suddenly realizing he's still wearing socks on his hands, takes them off to return to his feet, while keeping his eyes on Xellos and Val.