Physics
For the ball to "change directions" it has to "cease moving". You can explain this using simple physics, take you car for example, you are driving forward down your street when you realize that you left your plate shoeson the dinning room table at home that you need for the game you are heading to. You are traveling at +20 MPH and decide that you need to BACK UP to get back home and get your shoes. To put the car in reverse you must slow from +20 MPH to 0 MPH the negatively accelerate to say -5 MPH. at that instant that you hit 0 MPH you have CEASED MOVEMENT.
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"Contact does not mean a foul, a foul means contact." -Me
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