You state that the left arm/forearm flying wedge should remain intact through this horizontal hinging motion. I agree. However, isn't the entire left arm flying wedge supinating slightly during horizontal hinging - if the back of the left hand is perpendicular to the ground, and not the inclined plane? If the left arm/forearm flying wedge is supinating slightly, then the right hand must be pronating slightly at the same time. It is my impression that the degree of right wrist bend decreases during the followthrough - because it is pronating. I suspect that this phenomenon is happening in this sequence of Tiger Woods swing. He states that he "feels" that the knuckles of his left hand start to face groundwards after impact - which is the process of supination.
Note in image 3 that Tiger's right wrist is less bent. However, that doesn't necessarily mean that the left wrist is bending. It could be that the decrease in bend of the right wrist is due to pronation and the left wrist is supinating while remaining a FLW.
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