RedactedNarrative: operator was enjoying a day on Red Fleet Reservoir operating his PWC.  He was making a right turn and started to come off of the PWC.  As he was being thrown from the PWC, his right hand twisted the grip throttle to full throttle.  When he fell off the PWC, the grip throttle did not release and there was not a kill switch on this PWC.  The PWC's travel course straightened out and ran straight into the rocks by south beach.  The PWC was a total loss.