"Viciously, with full intention, he hurled his spear at Ralph. The pint tore the skin and flesh over Ralph's ribs, then sheared off and fell in the water. Ralph stumbled, feeling not pain but panic, and the tribe, screaming now like the chief, began to advance." (Golding 181).
Under the category "harm" Jack is fighting with Ralph showing Jack becoming a killer show his id and forgetting his innocent self.