Questions that Overture raised

[Kedjane]

Oh, missed a couple of things in Penumbra's post.
I'm guessing they didn't let him in because he's a guard of some sort and they didn't attack him from anything I've heard. They were looking for him at some point, though.

By the way, who closed the door in the last corridor when the lights start to shut down? That is my newest question...

Absolutely meaningless question. Perhaps it simply was a one-way door, afterall it seems Red is the only one who made it out. Perhaps Red put some lock-device on the outside?
Anyhow, whoever it I doubt we'll have a flashback showing it or anything at all and it doesn't really matter. It could have been just a random scientist-zombie.