don’t know the yellow book well enough to know if this is totally TGM compliant, but here is how i view swinging vs. hitting:
first, i think it is helpful to look at the motion at shoulder level…so, grab a club and set up…then bring the club up to shoulder level and make your stroke…if you swing, at some point your trail hand should rotate to be palm skyward with the clubshaft and clubhead still roughly parallel to the plane of the shoulders…the butt end will be the closet part of the club to the “ball” and is the part you pull back toward the “ball” until release when the palm rotates back from skyward (parallel to the plane) to targetward (roughly perpendicular to the plane) and the clubface to the “ball”…if you hit, you keep the trail palm facing the “ball” and rotate the clubshaft and clubhead (around PP#1) to be roughly perpendicular to the plane of the shoulders and PP#1 is what you push back to the “ball” until release rotates the clubshaft and clubhead back to parallel to the plane and to the “ball”