In this fight we see a case in which the fighters end up going to the ground. The dude on top punches the other guy causing him to bleed quite a bit, but then things end up taking a turn and the dude who got hurt ends up on top using ground and pound, luckily it was a one on one fight, and there were people who stopped the fight. We can see that the black dude was actually in pretty good shape, very muscular, but he still lost the fight, at the end, they ended up talking which is what they should've done in the first place, instead of resorting to punching someone in the face, but whatever.
It was not a case of multiple opponents, or weapons being pulled out, nevertheless, it still shows how even without those other factors it can get pretty dangerous if there's no one to stop the fight.
This is the reason why I decided that I need to incorporate counter grappling drills in my training. I don't wanna go in there, with a grappler mentality of taking the fight to the ground and keeping it there, I want to go with the idea of, DON'T even touch the ground, and if you do, you need know how to stand up as fast as possible, otherwise things might get pretty ugly for you.