The restricted area is the hallway that contains locked doors leading to Ketheric's, Isobel's and Balthazar's private rooms. I saved my game while in the area just outside to the left of this restricted area- the place where you talk to Z'rell and Radija. Literally no one was aggroed, this was before I attacked a single NPC in the tower. I saved my game right after talking to Radija. What I don't understand is why, the more I reloaded the save to try to fix the dialogue not showing up again with the guard, the more the save file changed, until I was reloading into immediate aggro from every NPC on the screen.
