How does the author use foreshadowing in Among the Brave?

“Then, more to herself than to him, Mother added, “And things could be worse.” Somehow, that wasn’t comforting. Luke didn’t know why, but he had a feeling what she really meant was that things were going to get worse. He snuggled tighter against Mother, hoping he was wrong” (pg. 19). Luke's feeling that things are going to get worse foreshadows the family's increasingly difficult circumstances.