Read the following extract which takes place just after an argument between Ralph and Jack about letting the signal fire die out. Then answer the questions which follow.
Ralph's final word was an ingracious mutter.
"All right. Light the fire."
With some positive action before them, a little of the tension died. Ralph said no more, did nothing, stood looking down at the ashes round his feet. Jack was loud and active. He gave orders, sang, whistled, threw remarks at the silent Ralph—remarks that did not need an answer, and therefore could not invite a snub; and still Ralph was silent. No one, not even Jack, would ask him to move and in the end they had to build the fire three yards away and in a place not really as convenient. So Ralph asserted his chieftainship and could not have chosen a better way if he had thought for days. Against this weapon, so indefinable and so effective, Jack was powerless and raged without knowing why. By the time the pile was built, they were on different sides of a high barrier.
Which of the themes of the novel is Golding highlighting in this passage?