Probably 2D because it'd be amusing if he actually joined in on the fight. And he's also tall so I could hide behind him. And he's not someone who would accidentally end up killing someone else in a fight.
This may sound really silly, but...the person I would want 由 my side in a bar fight is my mom, if she was still alive. Whew man. 你 would have not wanted to get into a fight with my mom. She didn't look like much, but she would have beaten the crap out of anyone.