The Caésar of Burning Rome would have us believe the rock gets thrown because the hands slow down.
I believe the rock gets thrown because we let it go.
What causes the hands to slow is an inability of the human motor to generate the required force. The required force (to the keep the hands moving fast) as the club releases, begins to increase. The club is pushing back on the hands.
Some golfers foolishly follow their instructors' advice and intentionally try to slow their hands. I'm saying the dynamics are such that hand slowing can/does occur and that is does not mean momentum is being transferred in the convention (impact) sense. It simply means there's not enough horsepower available to keep them moving at the same speed. The cg of the club has moved away the center of rotation and therefore inertia has increases... more torque is needed... more horsepower.
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