Yes, it is as simple as that and Swain explained the process in logical, workable terms that I am going to apply to a screenplay. Just like each exchange of dialogue must have a purpose, so must each Scene. Inference or audience conclusion is what you want. The character encounters a Conflict or Opposition to achieving this scene s Goal. The Scene ends when Disaster interrupts the goal s achievement and forces the character to go another direction, whether that action is physical, verbal, or emotional.
Interruption is the key concept here.
The moment the character perceives the new information Swain s Scene ends. Sequel Where Scene provides the intensity and building blocks of your script, the Sequel portions are the glue binding the blocks together. The Sequel sections can be as quick as one sentence or they can be stretched out to slow the pacing before climbing up to the next building block Scene in the story. Many good writers miss one of the elements of Sequel and have to keep re-writing trying to fill in that logic. If you attend to it right up front, you will save yourself some frustration.