Phil. I believe you have a tape Ballroom Lines with Marcus Hilton. If you go to the Eros Line to the Right (Last example) followed by a Curving Feather plus an Open Imputes Turn. If you put it into slow motion and take the floor boards as an alignment you can see how wide he steps in relation to the floor, also the strong CBM plus two other things. Look for the shaping of the left foot and the veering in of the right knee.. It is interesting if you watch the shape of the Right Foot at the end of the curved Feather into the Open Impetus. Which for me goes to prove that you cannot try to be too techniquely correct. Have a look at another dancer and we have other differences. I still have the old book and there is no shaping of the feet in it at all.