Those true fights are serious business.
Years ago I heard what sounded like two bucks fighting off in the distance. After glassing for a bit, I found the source of the noise - two 175-180 class bucks about a mile away. I closed the distance as fast as I could but it still took a long time to get close to them. As I got to about 100 yards from them, I could see that one of them had gotten his eye poked and it was hanging from the socket, but he was still fighting. I was trying to get within bow range but the one-eyed buck soon overpowered the other buck and chased the loser off over the hill. They ended up both jumping the fence off of public land and out of site.
It was unbelievable how long and aggressively they fought and the fact that the one buck kept going even after losing his eye. Their drive to propagate is so overwhelming.
In my years I have come across a couple other bucks that had lost an eye (likely to fighting) and seen both elk and deer harvested that have had broken antler fragments imbedded into their skulls and under their capes.