From general lines, with the ends forming a tandem: In each line, the end facing out Circulates. Meanwhile, each of the other dancers, in a single, smooth motion, faces the vacated spot, takes a step forward, and turns another 1/4 in the same direction he first turned. Ends back in parallel waves or lines.
The non-circulators' part is a single motion, rather than a 3-part move. This call can be fractionalized into halves, as shown below.
For Teaching: You can describe the non-circulators' part as a Run toward the vacated spot. This captures the idea of a single, flowing motion for them.
Timing: 6