MACNEIL HOUSE: Chris brings Karras to her home. Chris and Karras are ascending the staircase. When they reach the door we see Karl near a huge headboard with straps and padding on it.
KARL: It wants no straps.
Karras stares at him, then gives Chris a look. He plucks up his courage and enters the room.
REGAN'S BEDROOM: Karras stops as he sees Regan, on the bed, arms held down by a set of restraining straps, it seems no longer entirely Regan but something somehow demonic that now lies on the bed and stares at him. Her face is puffy, scratched and bruised from self-mutilation. There is a sustagen flask used for a naso-gastric feeding, the tube is placed up her left nostril. Karras is momentarily taken aback. Then, reining in his revulsion, he slowly and warily closes the door behind him, and walks around the other side of the bed.
KARRAS: Hello Regan. I'm a friend of your mother, I'd like to help you.
REGAN/DEMON: You might loosen the straps then.
KARRAS: I'm afraid you might hurt yourself, Regan.
REGAN/DEMON: I'm not Regan.
KARRAS: I see. Well then let's introduce ourselves, I'm Damien Karras.
REGAN/DEMON: And I'm the Devil! Now kindly undo these straps!
KARRAS: If you're the devil, why not make the straps disappear?
REGAN/DEMON: That's much too vulgar a display of power Karras.
KARRAS: Where's Regan?
REGAN/DEMON: In here. With us.
KARRAS: Show me Regan and I'll loosen one of the straps.
REGAN/HOMELESS GUY: Can you help an old altar boy Fa-dah?
Karras looks at Regan. He's puzzled by what she has just said. He sits down on a chair beside the window.
REGAN/DEMON: Your mother's in here with us Karras, would you like to leave a message? I'll see that she gets it.
KARRAS: If that's true, then you must know my mother's maiden name. What is it?
Regan keeps a sharp stare on Karras. Karras' smile turns to an angry stare. He rises and moves to her bed side.
KARRAS: What is it?
Regan leans forward and vomits a disgusting, green bile in Karras' face. Karras wipes it off, coughing.
Regan keeps her eyes fixed on him, with green vomit covering her night gown.
BASEMENT: Karras is looking through some of Regan's drawings. Chris approaches him with his sweater, now clean. She hands it to him.
KARRAS: Thank you. Look, I'm only against the possibility of doing your daughter more harm than good.
CHRIS: Nothing you could do would make it any worse.
KARRAS: I can't do it. I need evidence that the church would accept as signs of possession.
CHRIS: Like what?
KARRAS: Like her speaking in a language that she's never known or studied.
CHRIS: What else?
KARRAS: I don't know. I'll have to look it up.
CHRIS: I thought you were supposed to be an expert.
KARRAS: There are no experts. You probably know as much about possession as most priests. Look, your daughter doesn't say she's a demon, she says she's the devil himself and if you've seen as many psychotics as I have, you'd know it's like saying you're Napoleon Bonaparte. You ask me what I think is best for your daughter. Six months, under observation in the best hospital you can find.
CHRIS: You show me Regan's double: same face, same voice, everything. I'd know it wasn't Regan. I'd know in my gut and I'm telling you that thing upstairs isn't my daughter! And I want you to tell me that you know for a fact that there's nothing wrong with my daughter except in her mind! You tell me you know for a fact that an exorcism wouldn't do any good! You tell me that!
Chris opens the door for Karras. He steps out on the stoop carrying his sweater.
KARRAS: Did Regan know a priest was coming over?
KARRAS: Did you know my mother died recently?
CHRIS: Yes I did, I'm very sorry.
KARRAS: No, is Regan aware of it?
CHRIS: Not at all. Why d'you ask?
KARRAS: It's not important, good night.
Karras exits the gates and crosses the street. We cut to Kinderman in an unmarked car watching Karras cross the street. Kinderman then looks up to Regan's window and sees a silhouette moving around.
UNIVERSITY OF WASHINGTON: Karras is sitting in an audio cubicle listening to a recording of Regan.
REGAN (tape): Hello, Daddy? This is me! What can I say . . .
We can hear Chris coaching her to talk in the mic.
REGAN (tape): I hope you can hear me. Can you hear me okay? Um, I don't know what to say. Let's see, first we . . . no, wait. . .
They giggle. Chris urges her to tell him about Washington.
REGAN (tape): Okay. We're in Washington now, Daddy, and . . .
DAHLGREN CHAPEL: Karras is performing a service in the church.
KARRAS: He broke the bread, gave it to his disciples and said "Take this, all of you and eat it. For this is my body. "When the supper had ended, he took the cup, again he gave you thanks and praise. Gave the cup to his disciples and said "Take this, all of you will drink from it, this is the cup of my blood, the blood of the new and everlasting covenant and the mystery of faith".
REGAN/DEMON: What an excellent day for an exorcism.
Karras pulls a tape recorder out of his bag and props an microphone on her bed near her. Karras sits on a chair next to her wardrobe.
KARRAS: You'd like that?
KARRAS: But wouldn't that drive you out of Regan?
REGAN/DEMON: It would bring us together.
KARRAS: You and Regan?
REGAN/DEMON: You and us.
The bureau drawer flies open on it's own.
KARRAS: Did you do that?
KARRAS (pushes the drawer back in): Do it again.
REGAN/DEMON: In time.
KARRAS: No, now.
REGAN/DEMON: In time. But mirabile dictu, don't you agree?
KARRAS (presses record on the tape recorder): You speak Latin?
REGAN/DEMON: Ego te abslovo.
KARRAS: Quod nomen mihi est?
REGAN/DEMON: Bon Jour.
KARRAS: Quod nomen mihi est?
REGAN/DEMON: La plume de ma tante.
The demon laughs full and mockingly.
KARRAS: How long are you planning to stay in Regan?
REGAN/DEMON: Until she rots and lie stinking in the earth.
Karras pulls out a small vial of water.
REGAN/DEMON: What's that?
KARRAS: Holy water.
Karras moves to the end of the bed.
REGAN/DEMON: You keep it away.
Karras uncaps the vial and now sprinkles it's contents over Regan. Instantly, Regan writhes in pain and terror.
REGAN/DEMON: Ahhhhhhhhhhh! Ahhhhhhh! It burns! Ohhhh! It burns!
Regan's head falls back onto the pillow as she rolls her head from side to side shouting out indistrict gibberish:
REGAN/DEMON: Emit su evig!
Karras is intrigued and sits on the bed beside her. He moves the microphone up to her mouth an listens.
REGAN/DEMON: Ydob eht ni mraw si ti! Uoy ees I! Tseirp a si eh! Emit su evig! Nirrem! Nirrem!
KARRAS: Who are you?
REGAN/DEMON: Tseirp a si eh! Eno on ma I! Eno on ma I! Ahhhhhhhhhhh!