I would probably get everyone into their final positions first before teaching the move, so's that everyone knows where they'll end up.
After that the language would look something like, "Star Right all the way around. With your partner and without hands, slide out and away from the center of the set in the direction that feels comfortable moving out of that star. Ones move up through the center. Twos and Threes, slide back into the set into the positions we previewed earlier."
It would be slightly easier to teach if it weren't proper! Then you could specify who's leading whom for those slides.
I like this move and would like to see a version of it in a duple improper choreography, please! Sans the folks moving through the center, unfortunately.
Angela