RedactedNarrative: V1 WAS DOING CIRCLES IN FRONT OF V2. WHEN V1 CAME OUT OF A CIRCLE HE WAS HIT BY V2. OPERATOR 1 DISAPPEARED, THEN REAPPEARED BEHIND V2. OPERATOR HAD WENT UNDER V2, DOVE DOWN TO AVOID THE PROPELLER, AND SURFACED BEHIND V2. THE DAMAGE OCCURRED WHEN V1 AND V2 STRUCK.  THE OPERATOR OF V1 REFUSED TREATMENT.