watch it again and you'll see that williams connects really hard with a straigh right at the beginning of the fourth round and right after that is when cintron jumps out looking for a way out :hat
I don't know if he fell out or not on purpose but I gave the first two rounds to Cintron, the third to Williams, and Williams was winning the 4th. I guess the partial round makes it even? If not then I had Cintron winning.