well, sorry for saying that but the demo is short and not enough to get him banned.
about the first demo as Casper said he heard that guy when he jumped to the gunroom and he opened the doors and pressed E to get a gun that's enough tho, clear,
lets talk about the second demo, when he looked at the vent he heard the fd guy slashing it, and invisible thing doesn't work with the wallhack i mean if u make your self invisible he will not see u.., i don't know why he opened the door while u were hiding there but i think he saw the fd guy inside the vent and he opened the cell for him or lets say he was wallhacking why he didn't kill u after he opened the cell?? i think he didn't see u at all.
as i said the demo is short, nth in the demos.