I was playing on the UK 1-1 server (by Baty's request). When reconnecting after a crash I moved around and noticed that I was unable to open doors. I saw a player who I talked to. Apparently he didnt see me standing right next to him.
Suddenly my character got hit by an invisible force. When going back to the location I logged in at I saw a zombie attacking seemingly nothing. I realized he was the reason for the damage I was taking so I took him out.
When going back to where I saw the player before getting attacked I got hit once more from an invisible force and went unconscious immedialtely after and then died.
I then realized the player I talked to never saw me because I wasnt in sync with myself. My character never moved from where I logged in along side my client side character. Most likely the other player killed me at that positoin.