Kevin, I think that a swinger will have lost all pp4 sensation at impact...but they will have sustained pp3 lag sensation to and beyond impact.
I think the bit that Jeff is getting at is if you have a clubhead with right forearm on plane and lag pressure pp3 sustained....do you get more ball speed for a given clubhead speed (ie. higher smash factor).
HK seemed to have thought so - (from my understanding of TGM) - the pre-stressed shaft, lots of anatomical support to the shaft at impact to keep it driving....resisting impact deceleration. Analogy like would you prefer to be hit by a free flying fist at 30 mph...or a fist at 30 mph attached to a heavyweight? Some say the ball only knows energy (1/2 x mass x velocity squared)...so what about the size of the guy... fist -head collision is different to clubface - ball...
The science guys would say that any force you exert on the shaft at impact does not get transmitted to the clubhead/ball...the clubhead is just orbiting and colliding on its own...but it orbits in a better manner if you do as HK said....but maybe not resists impact deceleration for the reason he said it.
I do not know enough about the science to work out what is correct... but lag is a good thing...but maybe for reasons other than HK suggested.
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