I don't know who either of the fighters are. According to the title of the video one is named Collin Reuter and the other is named Gerald Fike. I'm assuming that Fike is the guy who was knocked out because well, the end of the video says Reuter is looking for sponsors. I also have no idea what event it happened at but a quick check on Sherdog says "SAARFC 2 - Solid as a Rock Fighting Championships" which sounds more like an Arrested Development bit than a fight promotion. Either way, Fike fell super weird and I was sure he broke his neck. But he didn't (Spoilers).