I don't know, it's about the most transparent and useless ploy ever, most fighters are trying to use reverse psychology, as in "well, you hurt me but I'm gonna make you think you didn't". Pretty useless really, also, I don't believe anyone did that before Muhammad Ali did the whole shaking his head thing and the rubber legged dance, at that time, because it wasn't such a widespread practice, it worked. Joe Frazier didn't know how badly he hurt Ali in the 11th of their first fight, if he had, who knows, maybe, just maybe he could have kayoed him (although Ali was practically impossible to kayo). At any rate, it worked, Joe Frazier looked at Ali and was puzzled and did not follow up his fusillade very well. Ali did it in the Bob Foster fight when he was really hurt and many others. It's one of those things he brought to the sport which really, only he made work. Like I said, it usually means you're hurt.