Boat pulling two passengers on a tube in busy waterway under bright sunny conditions.  One passenger on tube was ejected into the water.  Operator turned his vessel in an arc to pick up the ejected passenger.  Operator lost sight of the ejected passenger due to wakes and sunlight.  When ejected passenger was again in the operator's sight he was 4 ft in front of the boat.  Operator could not stop, and turned the vessel's motor as the boat continued forward striking the ejected passenger in the water.
Bruneau                       