[SPOILER] servant_grunt_2 in Archives

[Putmalk]

I was gonna say it's impossible to activate that grunt, but I think I may know how to do it. Just that nobody will actually ever do it; because it involves taking a path that isn't as common...

Go straight after leaving the bookshelf room, go right, go left, go left again, and head toward the big room (this would be the door that is normally walked through by the grunt). Then you activate the other grunt (servant_grunt_2) and the same thing applies.

So yeah, there are 3 grunts in archives, but only two will ever appear and both are harmless; one is a hallucination from the rubble, the other walks through a door for a second and then disappears.