RedactedNarrative: On 09/03/2018 at approximately 8:00am, Vessel 1 Operator/Passenger departed the Pickerel point boat launch on Big Trade Lake in a 2004 Lund 1800 Alaskan SS motorboat.  Operator was operating the motorboat and Passenger/Injured was sitting on the Operator’s left.  They proceeded west while operating the motorboat on plane.  Passenger/Injured pointed out a cove for them to proceed to.  Operator had to turn left to the south to proceed in a counter-clockwise circle to proceed to the cove to their north.  Operator over-corrected to the left while proceeding north and had to make a turn correction to the right.  As Operator began turning right, he felt the motorboat was not handling properly.  Passenger/Injured advised him to turn harder.  As Operator turned harder to the right, the motorboat made a loud noise and turned hard and sharp to the left.  Passenger/Injured was ejected into the water.  Operator was thrown to the rear left corner of the motorboat.  The motorboat circled multiple times in a counter-clockwise direction.  Operator crawled to the controls and shut the motorboat off.  Operator threw Passenger/Injured the Type IV throwable personal flotation device.  Two other motorboats arrived to assist.  Passenger/Injured told Vessel 1 Operator he was struck by the circling motorboat twice, receiving a large laceration on his arm.  Passenger/Injured was assisted in a different motorboat and taken to the Pickerel Point boat launch and emergency responders were notified.  Vessel 1 was towed back to the same launch by another motorboat.