This is essentially the step that is the second half of your basic, but I thought it deserved a look at of its own.
Begun when the leader is stepping backwards, it can be used to travel or kept on the spot depending on what is needed. The rhythm is Slow, Quick, Quick, Slow, Slow.
Start by stepping back on your Right foot when you are backing diagonally to the centre of the room. Next you step side on your Left foot, together with your Right and then side and slightly forward onto your Left. The final step is taken forwards - having come back to facing diagonal wall (which is where we generally start all our ballroom steps).
Step forward on your Left foot and then side onto your Right. Close your Left foot to your Right and then take a step back and slightly to the side onto your Right foot. Finish the step with a step backwards on your Left foot.