Just look on this picture:
http://postimage.org/image/cex0tnirp/
In what part of Citadel we are with Snderson and TIM?.
It's the tower yes? This one from council talk etc?
In last scene with Anderson, we see that arms of Citadel are opening. So we have to be in the peak of the tower (black arrow ). If not, we only see the wards ( from the base of the tower )
If thats right, theres a huuuuge bug here, cuz "magic elevator" take us higher! ( up )
Other option.
The dark, bloody corridor with bodies is the red arrow. But since the elevator take us higher, Crucible should be above our head- BUT in this position we couldn't see arms of the citadel.