Так и пишут: попала бы пуля чуть более перпендикулярно - скорее всего пробила бы и каску. И без каски выжил бы, КМК - ну рассекло бы кожу, кровишши натекло бы в крайнем случае.
The bullet passes "through the gap between the kevlar and the suspension," which means it was coming at a very shallow angle. Had it be a more perpendicular shot, the bullet may have gone through the helmet and blown his brains off.