Hennybogan - I thought that flat, level, vertical only applied to the left wrist at impact, and not to the followthrough phase of the swing. During the followthrough phase, the left hand will be vertical to its base plane (eg. ground in horizontal hinging, which means that it is supinated relative to the inclined plane). The puck release doesn't cause the left wrist to bend as the right hand pronates. However, the right wrist pronation does cause the left hand to supinate. While the right hand pronates, it also causes the degree of right wrist bend (that is present at impact) to diminish.
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