In chapter 8, when Jack and his group savagely kill the sow, Jack decides to offer a sacrifice to appease the beast, even though he is reluctant to openly admit there is a beast. He orders the boys to sharpen a stick at both ends. On one end, he plunges the sow's head and then he sticks the other end of the stick into the ground. When, in chapter 12, Sam tells Ralph that Roger sharpened a stick at both ends, he is inferring that Ralph's head, once Ralph is caught will be plunged onto a stick and that stick will be put in the ground to display Ralph's head in the same way that the sow's head was displayed. Ralph can't quite grasp the meaning of this because he still believes in civility and he is having a difficult time believing that the other boys want to hunt and kill him as if he were an animal. He hasn't truly learned yet what the Lord of the Flies told Simon - that the evil is within each one of the them.