He doesn't remember his own name, [he says, a little more quietly, a little more somber. It's not pitying, not a suggestion to walk on eggshells around the old man or anything, but merely an acknowledgement of understanding of what Nico says about ghosts— and maybe of wonder, too, that the stories remain long after the name is gone.

But also,] So that's why we call him 'the old man.' I think he likes 'Professor,' if you're talking to him.

[Anyway, time to observe this door while he gives the omni a chance to do whatever to the runes in the pictures; he genuinely does not understand how translation technology works. He leans almost physically up against the wall beside it, peering at the doorframe edgewise, then squints at the runes on the door itself again.]

It's not the same key; we can say that definitively. The door to this room had an inkling of darkblood magic, although I think we can safely say that was for the room, and not the door back there. [This is one of those too-big-for-logic rooms on his map, after all.] Maybe we're up; it could be our turn to be keys.

[Super exciting!! He looks down at the omni, frowns.]

This is nonsense. These runes must be too old for the omni to recognize.