How can the PP3 point be rotated another 1/4 turn if the backstroke is limited to below shoulder height and doesn't get beyond shoulder height (and doesn't get to the end position where the top of the shaft [which is now parallel to the ground] rests on the PP3 point)? Surely, if the backstroke is limited to a 3/4 swing, then the PP3 point is always behind (aft) of the clubshaft because that was where its position was at address setup? A golfer, who has a limited backstroke action, is not moving his PP3 point from its aft position during the swing.
I definitely cannot understand paragraph 2, which seemingly implies that if a golfer adopts a strong single action grip at address (10-2-B), that PP3 will not necessarily end up aft of the club at impact when the wrists swivel back to the vertical position (per 4-C-3) using standard wrist action (10-18-A). It seems to imply that PP3 can remain/become on top of the club. How is that possible in a swinger's 3/4 action as described above - when the PP3 point is never against the top of the shaft when using a standard strong single action grip and a limited backstroke action?