RedactedNarrative: V1 and V2 were south bound on the Colorado River in the area of the 600 Block of Riverfront Drive, inside Bullhead City, Arizona. V1 was following behind V2.  V2 slowed down and started to make a right hand turn.  The operator of V1 released the throttle and experienced off throttle steering loss.  V1 struck V2 on the starboard side hitting the two occupants causing injury