Looking at a face on video of a tour player swing even in slow motion it is a 2 dimensional image so it appears to the eye that the right wrist at followthrough both arms straight is flat but in my opinion it is not. Thats not to say either that it is still fully bent through centrifugal forces it has moved towards a flat condition but not completely flatened out. It would be far more beneficial to have a camera positioned directly pointing at the player from an up-line camera angle to get a better image of this.