So I sent my friend who takes sign language the video of when Coach and the class were doing sign language and she said he was saying "Turn around the door is not closed" which would explain that why all his hallucinations got darker because he kept walking toward the door/ darkness. The first dream with Lydia, she was trying to tell him not to open the door!
Dream Lydia told him to ignore the door when he wanted to close it, then to not go inside. There are a few translations to the sign language, and we still don’t know if Deatons translation was legit or not! Interessssting!