3. Downward inversions must maintain contact with an original base. Exception: The original base may lose contact with the top person when it becomes necessary to do so. Example: cartwheel-style transition dismounts 4. Downward inversions from above prep level: b. May not land on or touch the ground while inverted. She's either inverting all the way to the ground from base 1, illegal with two catchers. H.4.B. Or, inverting from prep level off of base 2, legal. H.3.