same as the slide in slide out but as it slides left and right it drags a new shoe image in from the left or right depending on the direction of the sliding shoe.
The image changes as it slides out. the gap between the shoes changes as the main shoe slows down the trailing shoe catches up as if its connected by a piece of elastic.
MoveEnough is still present like the privies one.
there is a delay introduced so when things stop moving there is pause before it starts to drift back or move.
