RedactedNarrative: THE OPERATOR OF VESSEL ONE WAS TOWING A SUBJECT ON A TUBE.  WHILE TRAVELING BETWEEN 20 TO 25 MILES PER HOUR AND 100 FEET OFF OF SHORE, THE OPERATOR MADE A TURN AND THE SUBJECT ON THE TUBE FELL OFF.  DURING THE FALL, THE SUBJECT ON THE TUBE INJURED HIS LEFT THIGH. POSSIBLY BREAKING HIS LEFT FEMUR.  THE INJURED SUBJECT DID NOT STRIKE THE BOAT, SHORE, OR ANY OTHER OBJECT.  THERE WERE SEVERAL WITNESSED WHO ADVISED THAT WAS WHAT OCCURRED.