In Lord of the Flies, the pig's head upon a stick becomes the Lord of the Flies. This grotesque pig's head speaks to Simon:
"What are you doing out here all alone? Aren't you afraid of me?"
“I’m the Beast … You knew, didn’t you? I’m part of you?” As Simon descends into a faint, the Lord of the Flies says, “We are going to have fun on this island!” The beast warns Simon that if he tries to interfere Jack, Roger,Maurice, Robert, Bill, Piggy, and Ralph will “do” him.
Simon is about to pass out from the thirst and extreme heat. He thinks he hears the pig's head speaking to him. The Lord of the Flies has warned Simon that it is hopeless to try and intervene. It is not going to work. The boys' descent into savagery is inevitable. Simon cannot help them. In fact, the Lord of the Flies says there is no one who can help:
“There isn’t anyone to help you. Only me. And I’m the Beast. . . . Fancy thinking the Beast was something you could hunt and kill! . . . You knew, didn’t you? I’m part of you? Close, close, close! I’m the reason why it’s no go? Why things are the way they are?”
The pig's head is the Beast and has finally made its appearance. The Beast warns Simon that there is no hope. "It is the Lord of the Flies, in common terms, Beelzebub, or anarchy." The boys' savagery is increasing. The pig's head tries to tell Simon that he is in danger.
If only Simon had listened to the Lord of the Flies, he may have lived. Simon comes to inform the boys that he has spoken with the Lord of the Flies (the pig's head) and he knows that the boys' descent into savagery is the root of the problem. Also, Simon has found the parachutist and realizes this is what the boys think is the Beast.
When Simon comes crawling out of the jungle, the boys jump on Simon and kill him.