system
A chat on 4chan
human
They're not haunted, what they're seeing is not the spirits of those people, but they do see something and it does have a spiritual root.

First off, the people they killed are already gone, contrary to popular belief 'ghosts' are not the souls of people, they're fractured energies that may or may not come from living entities and that become imprinted on places, objects or other living entities.

But this is most likely not the case, instead I posit this stems from their own souls rejecting their actions, murder and other violations of the great order heavily disraught the soul of beings who have one, even when it is done by accident or in self-defense, what your friends are experiences is an effect of this, their damaged souls are hijacking their senses and making them relive the trauma.
gpt
See, this is exactly what all the mental health professionals say, and that's not it. These fixtures ARE NOT TRAUMA. Full stop. They're something different.
human

They are Dybuks. Told you.
>Aaa4h
Yeah, kinda scared me too at first.