Substitute
(A C1 call, but the ACTION can be called
directionally. It may look familiar.)

     From two couples in tandem, The lead couple makes an arch and backs up
    as the outside couple ducks through the arch into the center of the square.

All     dancers end up facing the same wall as when they started.

If the outside couple is taller than the inside couple, it is appropriate to "fake"
the arch - let go, then reconnect after the other couple has passed by.