Mark was just itching to get his nose broken at this point. It was too much of a hassle to try to reach across the table and smash Mark's head into it, but he would definitely be getting his lumps later. Probably on the drive out of Gotham (The Rogues version of slug bug could get pretty bloody). But he'd presumably stopped the storm that he had whipped up in the first place, so at least he was coming around.
He resisted the urge to redirect Harley's hugs to Dumbledore over there, and instead sat quietly, knocking the ashes off his cigarette and onto the floor.