Let me tell you something my friends - throwing a person overboard into the open sea who is wearing a full combat uniform and equipment is potentially homicidal. (As is throwing one off an upper deck onto the deck below.) I don't know what happened on that ship, but I do know that you don't need a gun to kill someone. You can throw him into the sea, stab him or bash in his skull with a metal pipe or bar. Death or disability are the potential results.
Israeli teen lightly wounded from stone throwing in West Bank settlement of Kiryat Arba (Haaretz)