I would say it could definitely be either...In fact, the two geared characters I've had both died at the NWAF and it seemed to be via both ways mentioned. First, I was atop the ATC at NWAF and drank a soda to make room for my magnum rounds for the magnum I just found downstairs, all of a sudden my legs were broken, I was bleeding and unconscious and then died...I was the only person on the server. Then, about a week later, there was a downed heli in the middle of the NWAF (which was odd, as they usually spawn in the field at the end of the runway or in the field just outside THAT field) so I ran over, looted it and went back towards the hangars when suddenly I hear the sound it makes when you chop a zombie and my screen was black and I was again, knocked out. I woke up, got up and knocked out again then died...It honestly could be either. Roofs and stairs seem glitchy, but there are also tons of no-life, losers who sit and camp the airfields on lowpop servers, for hours on end hoping and praying that one of the few people who join will roll thru just trying to play the game, so he can satisfy his inner nerd and damaged ego due his immense shortcomings in life (probably a little dong), because he'd be instantly raped on a med/highpop server and needs to feel relevant. Point being, don't make yourself noticable and don't stand in one spot for too long at ANY airfield or high loot area, regardless of server population.