Thinking about how in Harrow the Ninth it starts off in a second person point of view and how it switches to first person when Gideon surfaces from the well.
How all this time, from the very start of the book, it was all narrated by Gideon, with exception the dream sequences made up by Harrow's brain. How she was the voice that described the forging of the arm as if they were two lovers joining hands after a long time apart.
The at the time, that made perfect sense to you.
How she was the one to describe how horrified Harrow was when she was ambushed in her own bathroom, probably straining to get a glimpse of everything happening even when stuck entrapped in a box at the very back of her brain.
How she was there, under the bed, with her; even when she thought she was alone, with no choice but to listen to the prayers slur together in a terrified, jumbled mess of words.
How she was there to see the corpse under the bed too. How she was ready to kick everyone's ass in Vengeance for how they treated her necromancer.
Now these are signs of Nonagesimitis.