Did this Kerry priest inspire the story of The Exorcist?

MARTY STALKER looks a little embarrassed. What started as a joke about the clichĂ© of the âcursedâ horror movie shoot has taken a decidedly odd turn as Stalker, the director of new exorcism documentary, Hostage To The Devil, struggles to explain the unnerving experiences he had while making his film.
âWhen I was reviewing the footage of Robert walking towards the house, I accidentally sped it up and at that speed, you could see this big shadow in the forest behind him. It just literally crept along and followed him as far as the house,â Stalker ruffles his hair uneasily. âIt was really creepy and strange.â