Okay, I know the walkthrough said to wear the citadel guard armour, but I never realised until -after- I'd killed all the guards and the deathnights, now, however, I find that I cannot access that small lever in the room where those 5 guards are (at the top of the main map). Sure, I kill all the guards, but the lever in that tiny room to the left is inaccessible, but on the walkthrough, it doesn't even mention that this room is locked... is this because it unlocks automatically if you assume the citadel guard disguise throughout this level? I pray this isn't the case, as I no longer have any saves before this point and would hate to have to restart the game... could someone please help?

Thanks in advance...