Not amazing really, because he was wearing a vest he was shot in the head. No doubt the reason he was shot in the head is because he was wearing the vest. I believe the other shots were to the legs - so I would guess that after being shot in the legs, he didn't let go of his weapon so more excessive action was required which ended up in the head shots.
This is a very terrible situation for everybody involved, the fallen officer, his wife and children, the soldiers and the police officer that fired the shots, their families, the San Pedro police department and everybody that lives here.