How to Make Ourumov a "Ghost" in Xbox Goldeneye! *Info in Description*

Описание: This can be done on any difficulty and with any cheats enabled. I chose Agent because Dr. Doak isn't needed to unlock the door. Some things to note about the glitch:

I have only tested this on the Xbox and N64 versions of the game, and I couldn't get it to work on N64. Anyone with the Switch and XBLA versions can confirm whether they work on those platforms.
There is a generous but specific period of time where you can shoot Trevelyan. It must be after he says "For England -- James", but before he drops his gun and kneels in front of Ourumov. Shooting him earlier will cause Ourumov to not spawn, and shooting him too late will not do anything. For consistency, I shoot him as soon as possible and then wait for Ouromov to begin firing at me after he runs down the stairs because he always goes to the same spot. (1:40-1:53)
Outside of the gas tanks room, Ourumov is completely invisible, can walk through anything, can't be interacted with, and his shots do no damage. Inside the gas tanks room, his properties are dependent upon how far into the room he goes, which I try to demarcate at 8:52. Whenever he is in the room, any visible part of his body may be shot and damaged. He still phases through every object but only loses collision with the player if he goes past the halfway point.
If you stand at the point where Ourumov initially walked through the wall, he is able to damage you with his shots. This occurs whether he is in the room with you or not.
If Ourumov walks back into the gas tanks room close enough to where he initially walked through the wall, he will turn back to normal and you'll have to perform the glitch again.
Shooting the gas tanks will cause Ourumov to run away, basically ending the glitch. It also causes the infinite guards to stop spawning, which normally is not the case.
If you damage Ourumov enough without killing him, he will become invincible and run off like normal.