ME. I could have continued to write that the RF is changed to a heel lead for step 5.
Back in the 50's, when I was a member of the IDMA, an examiner would have expected to hear what Terence said, that the heel lightly 'kisses' the floor during the turn of the Natural Pivot. This was to emphasise that the weight was held forward, and because of this the body weight did not leave the RF through the right heel.
This question came about because in a conversation with a dancer, I was told that Marcus Hilton gave this footwork in the action of continuous pivots in a lecture on the Waltz.