Got into a firefight at Tisy where I caught someone completely off guard when he walked into the room I was sitting in. I shot 3 times. First one a miss and 2 quick chest hits as a follow up with a FAL point blank range. Then I suddenly get hit from an unknown source and go unconscious and die 20 seconds after. I never saw him raise his weapon nor did I hear any shots. There was no way a third player could have shot at me at the location I was in cover inside of the building. No windows, no backdoor entrance and out of sight of the door.
The only explanation I have is that the player was out of sync with me and shot me first in my helmet and surviving 2 308 rounds aimed at his chest.
I had a ping of around 150 and there was no noticable lag.