He got knocked out because floyd moved at the last second and ricky got confused to as what hand to throw he threw the wrong hand at the wrong time and left himselft open to the quick left hook. It was mayweathers speed that threw him off balance for that punch. If mayweather didn't possess such superhuman speed, that ko would have never happened. Look how short the punch was. Hatton didn't get knocked out by the turnbuckle he got knocked silly by a perfectly timed piddly left hook.