He... should write that up in his notebook.
He doesn't.
Lev hugs his pillow tightly and closes his eyes and presses his face into it and pretends that it's Asher.
He's been acting like he's going to keep working at the Archives. He shouldn't. If he were smart, he would quit right now. This is not his area of expertise. He doesn't really care about the paranormal; he's not a physicist. He cares about people, he loves people, he wants to understand people, he does not want to spend his career studying paranormal artifacts.
This is not, it seems, a kind and gentle paranormal. This is a paranormal that will kill him if he is not careful. If he were smart, he would quit. He doesn't know anyone who died of anything paranormal; the paranormal seems to be quite dangerous; his risk is going to very clearly increased by working at the Magnus Archives.
He got this job so he wouldn't have to eat ramen anymore; if he keeps working at the Archives he is far more likely to die of the paranormal than he would to die of scurvy if he quit.
And Lev can't get over his bad feeling about this place. No one told him it was a potentially life-threatening gig. He cannot expect to be informed of information that would keep him alive. He cannot expect to be told.
He doesn't trust his coworkers. Shouldn't. He has no one to talk to except his notebook. No one to sanity-check. He will be alone, even more alone than he's been ever since Asher died.
He wants to talk to Asher. Even more than a hug he wants an outside view. He wants to yell at Asher that he's an idiot, completely wrong, Lev has no idea how he could be enough of a moron to come to that conclusion and then he wants Asher to be right and then he wants to cuddle him and then they can have a decision that isn't just Lev figuring out how to do it on his own.
He doesn't think well by himself.
There are nonhumans. He knows this from the statements he's transcribed. Some of the beings in the statements aren't humans. And-- they might not be people-- but they might be people. They might be alien people. Fundamentally different minds, working from completely different premises. Every person is a unique irreplaceable world, that's why he's a psychologist, but they all work on the same underlying physics. The paranormal minds could work... any way. They didn't even need to evolve, there are no constraints that he knows about on how they could be. Beautiful complicated intricate alien worlds...
If he quits, he will only ever be able to study human beings.
He'll work and he'll study and he'll learn and maybe someday he'll be able to see the world through alien eyes.
He stands up, creates a journal spreadsheet, notes down his feeling of being watched and when and where and what triggered it; and next morning he goes to work.