I've had an experience recently that led me to believe double cocking the left and right wrist can cause a hook.
It's my understanding that the only cause of a dramatic hook is a face to path aberration - so that must be the how... but what I have seen is double wrist cocking hands, along a slightly in to out path, result in a ball thats starts perfectly on line but violently hooks. So I'm having a really hard time wrapping my head around the why.
And before we proceed, let me make sure I've got a few things right... it's my understanding that the left wrist must be bent before it can cock (improperly). If the left wrist is flat and vertical it can't cock improperly.
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