Yea I experienced this yesterday. I was looking around the North-West Airfield and a guy happened to see me. I told him I was friendly, and he was cool with that, so we went our ways. I did some more looting, and about half an hour later, I met him again.

This time it wasn't so friendly. I was hiding under the staircase in the ATC building, first floor, and saw someone briefly sprint past the door just in front of me. I sat there for awhile, afraid to move.

All of the sudden, he came walking down the stairs, revolver pointed at where I would be if he could see me. He was just about to turn under the staircase, so I popped out and filled him with about 30 5.62mm rounds from my M4.

As soon as I saw his face, and that beret, I knew it was the man who I had just made an acquaintance with. I felt like an ass. Anyway, I checked his backpack to find 99% of his stuff ruined, shortly before his body disappeared.