VESSEL 1 WAS EAST BOUND PULLING THE VICTIM ON A WAKE BOARD.  VICTIM WAS ATTEMPTING TO PERFORM A TRICK AND FELL.  AFTER FALLING, THE VICTIM WAS STRUCK IN THE HEAD BY THE WAKE BOARD.  VICTIM WAS ABLE TO GET BACK ON BOARD THE VESSEL BEFORE PASSING OUT FROM THE HEAD INJURY.  VICTIM WAS TRANSPORTED TO CROSS TIMBERS MARINA WHERE THEY WERE TRANSFERRED TO MANNFORD EMS AND TRANSPORTED TO THE HOSPITAL.  AREA OF THE ACCIDENT WAS APPROX 2 MILES WEST OF APPALACHIA BAY BOAT RAMP AND APPROX 1.5 MILES AND APPROX 50 YARDS NORTH OF SOUTH SHORELINE.