Still waiting to watch it, but I’m drawing a blank on how it was explained in book one. I’ll have to look I up, but I believe the rings were forward facing and the hooks opened them up and the friction of the sand is what causing them to roll over and be able to steer.
It was done solo iirc and they just threw their hooks into the rings to open it while running parallel to it. Then it became a team thing? That where I’m blanking.