The correct answer to the Round Off Rebound to Prone quiz is the skill is Legal in Level 1. Some have questioned if the skill breaks the new Level 1 rule preventing tumbling immediately after a round off or round off rebound. It does not as performed in the video because the skill following the round off rebound is not tumbling. In addition, the skill is specifically allowed as an exception in the stunt twisting rule.
The explanation is based on the 2017-18 version of the cheer rules dated August 30, 2017.