It is the Thrust of the Downstroke Right Shoulder Turn -- the cumulative act of the Pivot -- that 'blasts' the Left Arm off the chest, not the "slowing down" of the Pivot. The Right Shoulder is the 'last outpost' of the Pivot, and its work is done when it has reached its maximum speed. Thereafter, along with the rest of the Body, it continues to Lead, but the torch has been passed to the Power Package (the Arms and Hands, their Loading and the Clubhead Lag).
But remember...
Pivot Lag, just as the Clubhead Lag, is never Released.
Swinging (Momentum Transfer into the Left Arm and Club) orHitting (Equal and Opposite Reaction for the driving Right Arm).
Must the release of the accumulators be sequenced such that they are spent as momentum transfer moves from the feet to the clubhead?
6-M-1 allows for overlap and much more.
So, ideally the Left Arm is Blasted Off from 8-9(RELEASE) to 8-10(IMPACT), and is not CONNECTED at 8-10(IMPACT) on through to 8-12(FINISH)?
Correct, Lagster. Pulled by the Hip Action, the Right Shoulder should be used to Load the Lag during Start Down. However, it is slow and cannot compete with the remaining Accumulators -- the Right Elbow, Left Wristcock and Left Hand Motion -- to crank up the Speed during Release.