In this third page of The Exorcist , Blatty continues to both advance his story and to introduce the characters most affected by this story. Again note how the audience is set up to have an answer to the question, but not Chris.
Storytellers often makes their readers a confidant.
Once, in the mountains of Bhutan, she has stared for hours at a Buddhist monk who was squatting on the ground in meditation. Finally, she thought she has seen him levitate. And perhaps her mind, that untiring raconteur of illusion, had embellished the rappings. With this passage the author suggests that all is not what it seems in our world. It also continues to develop her character via how she reacts to these rappings.