@SuperDicq He got shot in the ear - at just the right moment he decided to turn his head, so the bullet destined for his skull went through his ear instead.

If the sniper had aimed for center mass, he would be dead, as a bullet would have either gone through the side of his vest (most bullet-resistant vests have no armor at the side - training for the usage of such vests have a focus at keeping the vest pointed at the attacker), or likely punched through the vest (light bullet-resistant vests won't stop a rifle round, although some have metal or ceramic plates incorporated that have a good chance of stopping one if it hits the plate).