Alistair got gassed from doing nothing. No impressive strikes. No damage to Bigfoot.
He was winning on points comfortably, then a mixture of cockiness and gassing putting hands down... Stupidest thing to do, heavyweights can knock everyone out with one punch... He was probably at his lowest in confidence and strenght, still he hasn't recovered and probably never will... Overeem is UFC's scapegoat for PED...
