There were a few academic reasons that you closed the door, and from the inside, rather than behind you as you left. Her quarters held some measure of safety for you, as she warded with the paranoid focus of an escaped murderer, and therefore half as tightly as you did.
“Shiki, I see that is an ancient katana you have there. You can’t take out something like a five
hundred-year-old katana in here. What will you do if the Bounded Field gets cut apart?”
Hearing that, Shiki froze. Touko-san said it was a katana. But was that blunt metal plate, that looked
like an enlarged iron ruler that couldn’t cut anything, really a katana..?
“On top of that there’s even a Kuji on it. Is it ‘May those who preside over all warriors be my
His boyhood was spent in the wilds, aware of himself only as both predator and prey. There are skills that develop when one grows up forgotten and wild: keen eyes, light steps, impossible quickness. These skills would become North’s native tongue—that and a preternatural sense of where danger lies. As a boy, he fled from that feeling, but as he grew older he pursued it.
Nicholas Saint North and the Battle of the Nightmare King Chapter 6