How does the author use foreshadowing in State of Fear?

Crichton makes use of foreshadowing in Part VI when Ann decides to change her mind about getting on the plane when headhunters are mentioned. Ann, a minor character, believes everything the media tells her and was previously ready to jump on the bandwagon without a second thought. Her decision to leave the group foreshadows the fact that someone will become dinner for the cannibals before its over.