Our teachers advise us to do the writing first since it takes up most of the time, you have to make sure you pace yourself.
This occurs at the Exposition Stage of the story.
Jason is being told a key piece of information that will play a central role in the story. It introduces not only Jason and Mr. Manaby, but something that will drive future events, the 5:00 policy. The act of telling Jason is not yet Rising Action, however, because it only introduces the central elements of the story. The story has not yet begun to move towards its climax.
The doctor with the big forehead and big foreskin