The first three Sections of the Downstroke are Start Down (8-7), Downstroke (8-8 ) and Release (8-9).
The Action you describe is the Right Arm Throw (10-20-B). It is a defined Stroke Pattern Component (#20) Variation used to Trigger the Release of the Power Package. Accordingly, it is employed at Release (8-9), not at the "beginning of the downswing" (8-7).
You do your man a disservice to continue to assert otherwise.
It's interesting that the first sentence of 10-20 of the 7th edition which is a change from the 6th and it reads...."Trigger Types are classified according to the point of origin of the action." That seems to be consistent with Tommy's explanation on section 20 FOR SWINGING. Five ways to start the downswing...which I believe is consistent with Longitudinal Acceleration. As Tommy said "one smooth motion"....
This is my last response until after next Saturday....have a good week.
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