How does the author use foreshadowing in Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen?

In Chapter Twenty, the author was setting up the race in Mexico. They runners all showed up around the same time, at the same airport. As Christopher talked with the east coast couple about the west coast hero, he jokingly suggested they get him drunk and loosen him up. It was a foreshadowing of disaster.