Anonymous. Its not about feet, it is about dancing the movement. How could anyone make such a big mistake. The lady will make the Quarter Turn as the foot on step three closes. At the end of step three the lady will have completed her turn.
I mean this is probably the first steps taken by a beginner. If they are not taught correctly there, what other steps are not being taught correctly. You have never done a Professional Examination if you did your answer would not be the one they are looking for. That is one of the first things you would be questioned on.
Ask yourself also. Does the lady do exactly the same on the second third step of a Natural in the Waltz.
Don't forget where you learnt this.