RedactedNarrative: UNIT-1 WAS NORTHBOUND AND UNIT-2 WAS SOUTHBOUND ON FT. GIBSON LAKE.  U-1 WAS AT CRUISING SPEED AND U-2 WAS AT TROLLING SPEED.  THE OPERATOR OF U-2 STATED HE USED THE VESSEL'S HORN IN AN ATTEMPT TO ALERT U-1.  THE PASSENGER OF U-2 STATED HE WAVED AND SCREAMED TO ALERT U-1.   U-1 STRUCK U-2.  THE PASSENGER OF U-2 JUMPED FROM THE STARBOARD SIDE FRONT OF THE VESSEL INTO THE WATER TO AVOID THE COLLISION AND INJURY.  THE OPERATOR OF U-2 WAS BEHIND THE HELM AND SUFFERED A RIGHT LEG INJURY, REQUIRING MEDICAL ATTENTION.  THE OPERATOR OF U-1 STATED SHE DID NOT SEE U-2.  THE PASSENGER OF U-1 WAS LAYING DOWN IN THE BOAT AND WAS UNABLE TO SEE U-2.  THE OPERATOR OF U-2 STATED HE ATTEMPTED TO THROTTLE UP AND TURN BUT WAS STRUCK BEFORE BEING ABLE TO DO SO.