He doesn't use doors

My previous experience with this gman-like entity in Gmod has been bothering since I noticed it. I began searching forums and groups that had had similiar experiences and unexplainable situations within the servers.
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Someone posted the above picture. This person had a more horrific encounter with this 'thing'.

"...the screen became Black and White, there was immense static and fog began to cave in. Chatting was offline, but our mics still worked.
I wish they didn't.
Screaming was the next thing that added to our paranoia. The players began screaming, not like laughing screaming. Proper cries of fear and dispair. It was really awful.

I myself tried to escape the server with some friends. We had no idea what was happening, but we didnt like it.

That's when we all noticed something out of place; a player, or something. With the skin of a man in a suit. Without a face.
He began walking towards us, and we ran into a nearby room. We closed tht door and watched as this player came and peered through the glass."
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The player still isnt sure what happened on that map. But thankfully, he moved to a new server along with those friends of his. This picture is the only evidence of what went on on that server.