[Par71]

"10-24-B. NON-AUTOMATIC RANDOM SWEEP This procedure is identical with "A" above except that the deliberate manipulation of the Release (Non-Automatic Trigger) is delayed until some preselected point in the Downstroke is reached." (Emphasis/bolding supplied.)

Svsvincenzo,

What this means is: You accelerate the Hands (and that phase is called Downstroke) until your Hands reach some point that you preselected. So your Downstroke can cover a fairly short distance (a Random Sweep Release close to Full Sweep) or a fairly long distance (a Random Sweep Release close to Snap) or the longest possible distance (a Snap Release). When your Hands reach that preselected point you trigger the Release. That's when Downstroke ends and Release starts (as Sections of the stroke, Chapter 8 ).

Release in TGM is not the point when the shaft is parallel to the ground (or let's say it could occur at that point, but that is coincidental because where you release is up to you).

Incidentally, with a Full Sweep Release there is - technically speaking - no Downstroke Section (in TGM terms, Chapter 8 ) because there is no independent Hand Acceleration before Clubhead Acceleration.