Well, looks like you have more time on your hands than I do today. Here's what I wrote about you Skippy video. Nice. Too bad Skippy stumbled off the dance floor there. And you do see that she is behind her own count? Her cpb should be over her right foot on 1, and her heel has just landed as she counts "1," as is the man's. So, I'm thinking maybe not such a good illustration. And coincidently, Skippy was all over me about my center moving first, and it being over the weighted foot on the beat. I do appreciate your looking this up. And now that I think about it, this resembles both: Right Side Pass (from Back to Front, Man's R. side) #5 in WCS 101, and Throw-Out (from closed "Slingshot" position) #7. Of course the difference is that when you are in the "closed "Slingshot" position" and the man begins moving forward on "&" before the "a1" there is no arm to let out, (the man's hand is on the woman's back) so the woman moves with the man. Is the timing of the woman's movement different from a closed position than it is in side pass where the connection is by an extended arm? Really, I think, the word "wait" doesn't address the fine points of two people moving together and having to take 2 or 3 "steps" in one second, especially when average reaction is 0.2 seconds. As an exercise, sure, don't start forward without the leader moving away from you. Now, when you are repeatedly going from anchor to "walk walk", "don't get ahead of the lead" when you are coming out of your anchor makes more sense to me. I used to ask instructors these kinds of questions when I was studying Argentine Tango. (You know. Like the pro dancers who teach at festivals and come to the US to teach because they are that good.) The answers were never satisfactory, and I learned not to ask certain kinds of questions.