Hmm, something hard for me to explain but, it is a fact told by me(I know this makes no sense) from listening to my dad talk to other reverends about how demons hide deep inside a person's psyche: if the demon has been there during maturity levels of the host it can act as the host and have a connection to anyone who knows that person and create the illusion it has fled OR acted like it was never there.
This is one of the many things that deeply disturbed me about my Dad, he didn't think about how some of his beliefs could scare the crap out of a normal person, Like how a person has a very hard time living or doing simple tasks after the demon is exorcised from them because they always relied on that like an involuntary action such as breathing.
Not saying my dad was a demon hunter or anything so dramatic but he did run a mission and bible bookstore, he also visited hardcore missions like the ones you see on TV for homeless people I'm sure I didn't know everything he did, because I spent most of my teen years in different facility's. I do know that he thought my rebellion was an attack on him. We didn't really talk until I had a nervous breakdown at the age of 33, I wound up sleeping on his couch for a while before I decided to leave Michigan.
Sometimes I wonder if I am possessed.. you never really know because Satan knows more about the bible and religion than anyone on earth from what I understand he/it uses these things against us (Destroys us from within) I don't want to sound psycho so I'll stop talking now.
Wait! I am a psycho, I forgot! HAHAHAHA!
The above is something I wrote a long time ago save for the ( comment )when I was in the mood to talk to someone but never had anyone to relate this to.