I've been playing in this server with my friend for the majority of the day, a couple of hours ago I was suddenly attacked in Cherno. I turned around and noticed the zombies all crowding around a single spot in particular, attacking what seemed to be an invisible player. At first I just assumed this was because I were lagging, and that the players model hadn't loaded fully. After he killed me, I spawned again and began heading towards where my friend was. I eventually tabbed out of the game just south-east of Kamenka on the coastline, beside some rocks to respond to a PM. When I tabbed back into ARMA, I turned and saw a player crouched behind me with a scoped primary and silenced secondary. The first thing I had noticed was that his model was covered in blood and looked injured. Shortly after he dropped a pile of loot including weapons and ammo beside me and then suddenly turned invisible, I tabbed out of the game to start fraps, then I instantly began recording upon getting back in the game. Thankfully he was still there, heres what I managed to record: (Me and the friend I was playing with were VC'ing whilst I was recording) http://youtu.be/7oMYODGC-FU Unfortunately I never got his name as he was invisble, and because we were playing on a server which prevents you seeing the names of other players. As stated in the video this happened around 19:25pm-19:40pm BST. The players in the server are shown during the video. I hope this is enough proof, and sorry for the over-descriptive post. I just wasn't sure on how much detail to include.