I think a lot of what you see is the illusion of camera angle.
The ball from it's peak of the backswing, down and through your target should be on the same vertical plane.
If the camera lens isn't also on that plane, you get the illusion of a change of direction (inside out).
Norm Duke talks about the figure 8. But his description doesn't quite follow the laws of physics.
So it's more of a teaching tool than a true description of what is happening.
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