This is done by cut and paste from the above photos to show what we perceive to be the actual dismount. It does not allow for the forward momentum of the horse and rider.
It is easy to see how beautifully this vaulter executes her moves. Clearly, she is the lovliest one, although they all do have their strengths. Hats off to these wonderfully skilled vaulters and to the people who catch their magnificent moves with their cameras.