In this, he is using a wall hack. He seems to know exactly when the players appear in a stairwell, etc. I have seen him try to shoot through walls, failing because of too many. Many times he shoots people simultaneously (aim assist) and more.

This is the same guy as my post for player o... he changed his name to 1 later on after my demo.

oh....lol, how do you know that?

They're actually two different players, as they each has a separate IP, GUID, and are located in different geographical locations.

This demo is clean.

Hmm.. watched him change his name in the console... It wouldn't surprise me if he was using an IP changer and proxy.