If the rest of the group is on board with kicking him, I would suggest that everyone stop and wait for the loot window to time out. If the troll wants to try and solo a boss to keep the loot window open, he's welcome to do so - it'd probably be good entertainment to watch him try.
I feel sorry for every subsequent group that gets stuck with this bastard. If he wasn't happy pulling more he could have just said no and that would be fair. Nobody should have to tolerate behaviour that is deliberately aimed at making someone else miserable.
