I've had this problem in both DayZ mod and the standalone. I will get the drop on some enemy player shoot them probably 5 times in the back while they're dying they have time to turn around shoot me with a full mag before the lag catches up and kill me too. I had this happen to me earlier today on the standalone version, I snuck up behind a guy with a m4 hit in the back with my hatchet 4 times, he runs down the hallway in the barracks and meanwhile I am on top of him still swinging with my axe and hitting, blood is pouring off of him. He turns shoots one time down the hall of the barracks (at this point im outside of the barracks BEHIND HIM) and I get one shot knocked unconscious. Lag + DayZ = Bad