How does the author use foreshadowing in The Trumpet of the Swan?

In Chapter Three, A Visitor, White returns us to the home building and the laying of eggs. During the chapter, the reader is shown two visitors to the pond. The dangerous one, the fox, and the savior, Sam. This is a foreshadowing of a life. There will be dangers, and there will be times that one is saved. Everyone sometimes need someone to help us. The solitary swans and the solitary boy come together and Sam helps the swans. This is also a foreshadowing of Sam's life and his helping his baby buddy in later years.