According to Deadspin on Dec. 27, it appears that MMA fighters had taken on the novelty of wearing superhero costumes when fighting each other for this match. It appears that the Marvel character Spider-Man takes on the DC characters of Batman and Robin. The play-by-play gives a written transcript of what occurred at the event.
It does appear that the MMA fighter portraying the Spider-Man character is performing rather well against the Dynamic Duo and about half way through the match, it appears Robin had enough thus leaving the ring. The remaining fighters wandered about the floor taunting each other with cartwheels and other acrobatic moves.