RedactedNarrative: This was a single vessel incident.  The subject slowed the vessel down and changed direction to enter the slough.  The vessel struck a submerged object causing the operator to be ejected from the boat off the starboard side.  The boat turned and traveled back in the direction of the subject that was ejected.  The subject grabbed the throttle causing injury to his left elbow and lacerations to his right shin due to contact with the vessel's propeller.