RedactedNarrative: The accident occurred during a passage from Westbrook, CT to Antingua, BVI.  At approximately 0200, while adding additional reef in the mainsail, victim fell due to the high sea state.  He landed on his shoulder onto a deck hatch.  Thinking his arm might be broken, we immobilized the arm and gave him pain medication.  We diverted to St. Georges, Bermuda where he was seen at the local hospital.  It was determined tha this humerus was broken. He flew home.