Is the question multiple choice? If not I would assume that the author is trying to convey a sense of horror and anxiety to the reader. The high-pitched screaming also reminds us that they are merely children as well.
Explanation:
The Lord of the Flies is a novel by William Golding that emphasizes the true nature of man kind and how wicked people can be.
One possible theme could be “how a person is affected by growing older”. Shakespeare compares old age to the seasonal shift. The narrator also describes how aging is harsh and ultimately comes to see its inevitability. Hope this helps!