This incident occured during a sailing class offered by the ODNR Division of Watercaft.

Vessel 1, with 2 persons on board, began to list to one side.  The Occupant aboard Vessel 1 then moved toward the high side to try to provide provide balance.  As a result of these actions the Operator panicked and let go of the rudder resulting in the boom swinging around and striking the Occupant in the head and pushing the Occupant off of Vessel 1.
Marblehead                    