Surely you are wrong to label the change in the clubface angle from open-to-close that occurs one foot prior to impact a horizontal hinging action. That surely is the release swivel action as it occurs pre-impact. Horizontal hinging occurs post-impact and one can see horizontal hinging occurring in Anthony Kim's post-impact swing (during the followthrough phase).
What interests me about the left hand movement that occurs in the horizontal hinging action is that the left hand not only moves up the inclined plane - it also seems to supinate slightly while moving up the inclined plane, thereby causing the knuckles of the left hand to face slightly more groundwards during the followthrough phase of the swing. During the finish swivel, the left hand supinates much more (due to a different set of biomechanical actions). However, my interest in the left hand motion during horizontal hinging relates to whether the left hand supination (roll) phenomenon that occurs during horizontal hinging blends seamlessly with the left hand supination (roll) phenomenon that occurs during the finish swivel action.
Golfbulldog
I agree with your understanding of the different biomechanical mechanisms underlying the supination (roll) of the left hand during both horizontal hinging and the finish swivel. My main interest lies in the supination-roll "feel" that occurs during horizontal hinging and whether it blends seamlessly with the supination (roll) of the left hand that occurs during the finish swivel action.
I also would like to know whether Nick Bradley's description of the puck release in his book "The Seven laws of Golf" is a description of the supination (roll) action that occurs during the horizontal hinging period and finish swivel period.
Here is the photo showing his puck release swivel action.
Threaded Mode
