The first video is a simple double marking drill. It is Phase I in a planned series of training steps. The dog at the line assumes responsibility (trained to do so) for lining up correctly, marking the falls and not spending time being controlled at the line. The expectations are well engrained.
Stand alone singles have been a steady routine...for years. Kooly is an older dog and has been "around the block" many times. He is a willing partner and is helping with the experiment. Watch his body posture, focus and responsiveness.
The plan is to develop a process for presenting multiple marks in the field via a "stand alone" format. The second video is a first time take of Phase II
Simple, Stand Alone Marking Drill - YouTube (Video)
First Take "Choas" Phase II YouTube (Video)