Once upon a time, Father Merrin and Damien Karras were facing a big challenge. Father Merrin warned Damien about the tricky demon they were dealing with. The demon liked to mix lies with the truth and confuse them. In Regan's room, Father Merrin began the exorcism, but the possessed Regan began cussing and laughing. Damien bravely told her to be quiet. Suddenly, the bed flew up and then back down! Regan even started levitating! Merrin and Karras shouted the power of Christ compels you, but it wasn't easy. The demon made Regan vomit on Father Merrin, and he tried to fight back by putting a scarf on her. Regan even spoke with Damien's mother's voice, which made him sad. It was a difficult moment, but Damien knew he had to keep going. He went downstairs and told Regan's mom, Chris, that Regan wouldn't die. When Damien returned, he found Father Merrin had passed away. Damien was angry at the demon and attacked it, telling it to take him instead. The demon tried to go inside Damien, but he made a brave choice. He jumped out of the window, sacrificing himself to save Regan. Finally, Regan was back to her normal self, and Chris comforted her as they both cried. Nobody in the world would ever forget Damien's heroic sacrifice.