RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHILE DRIFTING AND WITH THE ENGINE STILL RUNNING. AS OPERATOR 1 AND PASSENGER 2 WERE PREPARING A WAKE BOARD FOR PASSENGER 2 TO WAKE BOARD ON, PASSENGER 2 EXITED VESSEL 1 VOLUNTARILY FROM VESSEL 1. AS PASSENGER 2 WAS GETTING READY TO PUT THE WAKE BOARD ON THEY WERE STRUCK BY THE PROPELLER OF VESSEL 1. PASSENGER 2 SUSTAINED SERIOUS INJURIES FROM VESSEL 1'S PROPELLER. NONE OF THE OTHER OCCUPANTS SUSTAINED ANY INJURIES. VESSEL 1 DID NOT SUSTAIN ANY DAMAGE.