RedactedNarrative: V1 was returning to Fort Desoto Boat Ramp and following closely behind V2.  Due to V1's proximity to V2 and speed he was traveling V1 impacted the rear of V2 after V2 slowed.  This caused minor damage to both V1 and V2, and injured the operator of V1. Operator sustained injuries from collision.  Broken Left Pelvis and puncture wound that according to attending physician most likely occurred from Pelvic bone being pushed through soft tissue.  Also contusion on left side around his rib cage.