It wasn't a hard fight to score... ALL of the headsnapping punches were landed by Marquez... he also counterpunched the hell out of manny all night.
Yet Marquez was the one with bruised eyes, a swollen face...
Not all punches are "head snapping". Pacquiao fights straight up, Marquez is compact. Marquez ducks into punches. They still land, often with more power, where as Pacquiao is darting around trying to avoid shots so it looks like Marquez is smashing him about when that wasn't the case.
That was a razor close fight. I thought Marquez had a better case for winning the 2nd than the 3rd fight TBH. He was too inactive in the 3rd fight and really did very little in the last 4 rounds.