There is no doubt he held it on too long. Pierce is already tapping and it takes the ref to step in before Palhares lets go. There is no need for this in MMA. MMA should be about respect, and Palhares has none of it. Hector Lombard was right when he said that Palhares was one of the disrespectful guys in MMA, and that he was happy to knock him out. I can see why now.