Two great points made by Lagster and EdZ. Amplifying these insights:
1. The Turning Shoulder Plane produces an Off Plane (vertical) Loading Action. Nevertheless, as previously noted, this 'lifting (Arms) while turning (Body)' procedure takes the Hands directly to a Squared Shoulder Inclined Plane location. Hence, "an Inclined Plane with a vertical force."
2. At all times, as with all other Delivery Line procedures -- On Line or Cross Line -- the player senses his Motion as parallel to the selected Line.
Thanks Mr. Yoda and Mr. Ed Z!!!
Any more discussion on this? The flashlight and laser aids have been around for a while now, and probably most use them according to the TGM teaching of "pointing to or parallel to the Base Line", as the way to use them.
This may be worth looking more in to. What do you think?