Around an hour and ten minutes in, Adam falls asleep watching TV on the couch. If SH triggers you, skip ahead or look away from this point until he is at work in the next scene.
What happens is that Adam dreams that David forces him to cut his wrist with a large kitchen knife. Adam wakes up just as the knife starts to cut him. He wakes up, seeming relieved that it wasnt real, until he suddenly notices that there are several large cuts on his arm. Its shown briefly but its pretty graphic and bloody. Its never shown or brought up again, so you can skip the scene without missing much.
there is light gagging and towards the end “david” has black liquid coming out of his mouth. He also spits it out but i looked away and muted to be safe. Nothing really happens during the that scene besides the main character fighting back! it’s safe once “david” starts getting attacked by the main character