Back in the Final Competition, Master HE and J were both near exhaustion. Their swords were a bit heavier, and their movements were starting to slow down. This is the 85% sensitivity's work.
Because it's using their normal five senses, even if it's just that, aside from feeling pain, there's the exhaustion as well. No matter how many times you play Golden Shangri La, if you are not physical and mentally strong, all will be useless in this competition.
J looked at the other person on the stage, his white robe was fluttering with the wind and dust from their clashing swords, he can see the sweat dripping from his forehead as well as the shaking of his hands that were holding the sword. However, he could only see half of his face right now. Yes, Master HE was still using a soft cloth that was hiding half of his face since the beginning of the competition.