How can Space Punshier Hulk kill the Watchers?

This truly pissed me off, because not much is explained on how he can just simply ignore the laws of omnipotence. Is this just PIS and why couldn't they just simply erase him. This hulk looks ugly too, why 4 arms why was he still hanging around with Bruce dead inside of his chest... So much truly bothers me about this alternate version of hulk. Do enlighten me about this, I truly don't know much and already I'm getting huge headaches thinking about it. Story ends not too long from there, one of the watchers survives kinda, but eh....

@kinglouie: I didn't mean it literally but it boggles my mind on how weird he's able to kill a watcher physically.

His only feat is stomping featless characters.

Reminds me of Superman prime one million