In chapter 11 of Lord of the Flies, what are the major themes from the chapter, and significance title?

You can find an analysis of the novel's major themes right here on gradesaver. I have provided the link below;

Everything goes down at Castle Rock. It is Ralph and Piggy's final attempt to get through to Jack and the boys. There is a sense of heroism in this chapter. It is a passive resistance, an offering of friendship to a power that wishes to destroy. In many ways it is evil triumphing over good.