RedactedNarrative: Vessel 1, a 2015 rented Yamaha PWC was traveling north on the Colorado River near the Sandbar at approximately while being Operated by OPERATOR 1.  Vessel 2, a 2015 Yamaha PWC was floating freely in the same area Operated by OPERATOR 2 when Vessel 1 collided with Vessel 2.  OPERATOR 1 advised that he panic and accelerated, causing the two PWCs to collide.  Both occupants were thrown from the PWCs, but were uninjured.