Walking out on the main event is bush league. I would expect that from a casual fan who was trying to get laid before the night was over, but not from a true fan of the sport. It's well understood MM is potentially the best all-around fighter across the board in MMA, despite not being the most exciting.
That finish blew my mind, I was in a three-way tie with 2 other people picking last night's fights and all three of us had MM winning, but I had it by sub and the other two had it by KO and decision, so I was literally 1 second away from losing.