In the end of the book, Beah describes the tradition of storytelling in his village, but it is not a chronological order of the book. The book is told in non-linear style regarding protagonist's flashbacks. This is a flashback and the correct answer is Beah has a flashback of his grandmother’s village before the attack.
Answer:
Generalization
Where with most ease and warmth he might employ his art:
Deceiv’d the quaking boy, who thought from so pure light
But she most fair, most cold, made him thence take his flight
To my close heart, where while some firebrands he did lay,
He burnt un’wares his wings, and cannot fly away.