In lord of the flies chapter 11, what are Jacks plans for Ralph? What earlier events might have foreshadowed this?

After Ralph's tense, exciting stand against the hunters, the ending of Lord of the Flies is rife with irony. Ralph had thought the signal fire-a symbol of civilization-was the only way to lure rescuers to the island. Ironically, although it is indeed a fire that lures a ship to the island, it is not an ordered, controlled signal fire but rather the haphazard forest fire Jack's hunters set solely for the purpose of killing Ralph