In most cases demons dont instantly possess someone. In addition possessions can vary based on the will power, and mental state of the human in question along with the paranormal power of the demon. Most possessions are incremental in nature as the demon brakes down the barriers of the mind, and to some extent is granted permission to enter at a sub-conscious level. Early signs of demonic possession include erratic behavior, sudden angry outbursts, nonsensical gibberish,...
Xavier Remington
I'm the Founder, and President of Mystic Investigations. Big time paranormal investigator and hunter of evil supernatural entities.