For people that Youtube takes forever to load (and its not really even worth watching this whole video). Basically, guy gets knocked out really quickly. They show the replay and the punch to the head is at best a glancing hit that in no way would cause a knock out so the announcers are wondering wtf. Crowd boos, the winning boxer takes the mic and it plays out about like a WWE episode with the guy talking (nothing happens, he just talks).
One of the comments says the losing boxer apparently had a condition and wasn't cleared to fight by some organization, so they changed the venue. There's also some mention of the hit he takes in his lower left abdomen might have actually been what caused him to go out.