The Aresti tells you the direction of the roller. When flying left to right, you do the stall turn on your right side and do the roller going back to the left and then do the humty on your left side. Of course there are no centering rules anymore. the you have to pull up into the humty, half roll and push outbound.

If you wanted to fly the same L - R but do the stall turn at the back of the box and come inbound on the roller that is ok as long as the plane is traveling on the correct L to R pattern. You would have to change the direction of the snap in #1 to left and change the roller to right aileron and change the negitive snap on the humpty to left. the humpty would also push inbound.