Part 6: David works with a rider who has issues at a fence to remind her of the training principles of a run out or stop. He discusses the rein back a tool, and the importance of the horse not getting to go where he wants, but having to go where the rider wants if he fails or refuses to solve the puzzle of a fence. The riders continue to jump and David holds them accountable to their responsibilities, ensuring that they notice any changes, and ride for their basic responsibilities, including choosing an appropriate speed, and making sure the horse is straight and jumping the middle of the fence.