I agree with iaoish, which is why I said it was kind of a bitch move. The guy obviously realized he was out as he was doing it thus the pussy hammer.
I'm just not a fan of smashing on a dudes face when he's out cold, no need for that in any sport, imo. If the guy isn't out, sure go for it if that's what you have to do to win, but I like guys like Anderson Silva who often knocks someone down and gives the guy a chance to get up if he wants, that imo is more gangsta then jumpin on a guy and pounding on his face when he's down.