If the door was already open, that might have opened the door even wider, Ed thought. First comes encroachment, where a negative spirit is given an opening to a human being, either through voluntary means, such as a satanic ritual, or through involuntary means, such as a curse or the performance of an unholy act. The second stage is infestation, when the demons first haunt a person's house. The third stage is oppression, when the spirits begin trying to take over the person living in the house. The final stage, after possession, is death.
Amazing things continue to happen.
One of the most amazing things is that some of the events are reported at all. His eyes began to tear blood and his mouth began to drool yellow phlegm. His face contorted into a hideous shape and he started breathing heavily. That bastard will never catch me. If he tries, I'll kill him.