A lot of times, fighters get not only physically tired but...

A lot of times, fighters get not only physically tired but mentally exhausted. It's like a chess match - you're thinking of offense and defense at the same time. It's almost exhausting to think about it. After a while, you just go, 'I'll move my pawn.' A lot of times in fights, people get exhausted, and they're just sick of trying to focus on it.