well, in some people's opinion, the fight was prematurely stopped by the ref because Sonnen didn't actually tap from the armbar and there was about 5 seconds left on the clock when the ref stopped it. Sonnen was winning the entire fight and looked to be dominant, so when the ref stopped the fight with 5 seconds left a lot of the fans said that if he let it go for the remainder of the time, Sonnen could have came out for the next 3 rounds and won a decision. personally i think it was a good call, because five more seconds of that armbar and Sonnen's arm was as good as broken. Sonnen looked distressed and was visibly in pain...but there were a lot of people who don't agree with the stoppage so this fight is happening again. i am really looking forward to it and i don't know who to pick in this rematch.
Here's a gif of the stoppage: