This is another dance where I just want to offer an alternative version.   My suggestion is simply that B2 be dropped.   At the end of B1, a perfectly good progression has occurred.   B2 is a repeat of B1, done by the couple that is temporarily in top position.   It is just as much fun the second time through, provided that the top couple remembers to start on time.   My experience is that that couple often draws a blank and gets into the figure late, which delays the beginning of the next round.   Since the dance has very little "forgiving" as it is, I have been teaching it without B2 and having more success with the dance.