Jason can’t stay holed up in Tommy’s apartment forever, so in spite of his antisocial tendencies, he’s coming back over with (more) champagne. He’s going to need to swap out his clothes to bring something new back eventually, anyway, so now is as good a time as any.
He’ll give a brief hello to anyone who got there first then go into the kitchen to continue to talk to Audrey in intermittent Spanish and pop open the bottle.