"Anonymous. I never comment on anything unless I have resarched it. The lady on a Spin Turn doesn't rise untill the end of the fifth step. From the end of the third she is down untill the end of the fifth. I'm not sure what you mean by a foot closure. You must mean when the feet are together at the end of three and the lady has lowered. So the point we are stuck on is step four. On a pivot or a pivoting action or a type of pivot we stay down. There is no lowering or rising from steps three to the end of five."
My comment referrred specifically to the rather difficult task of creating a full forward, progressive lowering from the foot closure position in which the lady finds herself midway through step three. Regardless if the next step will be 4 of a spin turn or 4 of the remainder of the natural, she will need to project her body strongly forward as her knees bend to complete the lowering. In contrast, men today almost never dance this action forwards, as 1 of the natural turn is usually commenced from a prep step rather than a lowering form foot closure. It's hard enough to do right that this action has almost vanished from today's dancing - the one place it remains is the end of that first half natural, and the challenge is given to the lady.
On a seperate topic though, step four of the spin turn is not quite a true, pure pivot even in the book. And in actual practice, it is danced much more like step four of a natural than it is written - the pivoting action is quite minimized, and there actually is the beginning of a hint of rise, though not necessarily enough that it would be written down if the book were to be rewritten today.