From what i've read, McKee's eye was blinded after that overhand, which is why he tapped so quickly. Reminded me of Cro Cop - Barnett where the same thing happened to Barnett.
what were Mauro and them yammering about McKee saying even before the fight that he would tap once he got hit? and also, Nate Diaz fought w/ one eye against Bendo for 5 rounds.