Unfortunately for him, Mu Huan's attacking style changed the moment the match started again. Each time, she would hit him in places where he could not bear the pain. He wrote it off as accidental strikes for the first two times, but the third, fourth, and the subsequent attacks all landed in spots that hurt him a lot as well. That was when he realized that something was amiss.
It was also then that he suddenly recalled her match with the first boxer. He had initially chalked it up to that boxer's lousy stamina and to him underestimating his opponent, which resulted in him being KO'd. Thinking about it now, he realized that that punch landed on the spot where it most easily made people collapse and unable to climb back to their feet!