Paul Schrader filmed a prequel to The Exorcist, but the studio decided it wasn’t scary enough. Psychological rather than visceral. So they brought in Renny Harlin (the auteur who brought you Driven, Cliffhanger, Cutthroat Island, Die Hard 2 and A Nightmare on Elm Street 4) to amp up the scares. Turns out Harlin’s “reshoots” lasted as long as Schrader’s principal photography of which they’ve apparently ditched everything.
I can just imagine Schrader being brought in for a scolding by some gasbag studio executive, a la Barton Fink: “We don’t wanna turn the Exorcist franchise into some fruity movie about suffering I thought we were together on that!”