Nice idea for a final chase, haven't seen many talk about that end-game concept. His normal chase feels interesting, not knowing where the player is right away and suddenly charging after seeing, great for unexpected scares.
Biology notebook would work if it replaced History notebook.
Like the mimicking mechanic. Thought of this with different negative affects. Grabbing fake item places it in your inventory and "locks" it there for a period of time, item eventually disappears on its own. Grabbing fake notebook forces the player to complete a minigame, can't exit minigame till completion. Both fake types would influence the teacher upon picking up.