Direct hansoku-make for protection of the contestant: the contestant loses this contest but can continue in the competition if applicable.
IJF SOR 18.2.1.1. To “dive” headfirst, onto the tatami by bending forward and downward while performing or attempting to perform techniques such as uchi-mata, harai-goshi, kata-guruma etc. it is forbidden to somersault forward when uke is on the shoulders or the back of tori.