This video is the answer to the question: "What happens if Harry tries to go from the end of the level to the beginning?"
As you can see, the game is not ready for such experiments: platforms, doors and bars behave strangely, since the game is waiting for the player’s actions from the other side.
This is a workshop level for the Flipendo spell, which runs on a modified engine from the second game (Metallicafan212's Harry Potter 2).