Magic Forums

Ah, so today I had a less than fun experience at my friends house who complains about having 'ghosts' 'demons' 'spirits' in his home. He talks about seeing shadows everywhere, feeling like he's being watched and very afraid in general. I was walking down a hallway with him and looked to my left where I saw an open door into a dark room when out of nowhere, it slams shut and I get shoved aggressively into the wall, knocking my air out. I fell down and recovered to look around and see nothing. The door slowly creaked open and I took my friend and ran out of there. Any explanation from you guys? What could this possibly be?