Burmese folk religion
These exorcists, or "ahletan hsaya", are said to possess powers that can fend away or challenge these evil demons. These exorcists were often seen as very holy, because they had to be to combat troublesome spirits. They attempt exorcisms by giving the nat offerings. As an interesting overlap with Buddhism, exorcisms can be performed by holding the Buddha up to the possessed person, in an effort to have the Nat flee. If the exorcist cannot banish this spirit alone, they often ask for the assistance of the nat-kadaw. Sorcerers, or "weikzas" also harnessed the power of these nats through many complex rituals, to gain their own supernatural powers.
The Exorcist (film)
Both priests witness Regan perform a series of bizarre, vulgar acts. They attempt to exorcise the demon, but the stubborn entity toys with them, especially Karras. Karras shows weakness and is dismissed by Merrin, who attempts the exorcism alone. Karras enters the room later and discovers Merrin has died of a heart attack. After failing to revive Merrin, the enraged Karras confronts the mocking, laughing spirit, and wrestles Regan's body to the ground. At Karras's invitation, it leaves Regan's body and possesses Karras. In a moment of self-sacrifice, the priest throws himself out of the window before being compelled to harm Regan. He is mortally injured. Father Dyer, an old friend of Karras, happens upon the scene and administers the last rites to his friend.