This is a great explanation and demonstration of the movement of the shoulders. Your detail quickly separates what most think is happening and what really should be happening.
The extra bonus of this discussion is seeing how your pelvis moves during the surf to level portion of the move, from the DTL perspective, while you are discussing the shoulders. The DTL is perfect for seeing the movement of the pelvis repeatedly performed. Though I have been watching and working that move, I understand it better now.
Thanks for the surprise bonus instruction.
Lance