The foreshadowing in the statement represents a hint or suggestion about future events in the story, specifically suggesting that Rainsford will face a dangerous situation.
The foreshadowing in the statement "Don't talk rot, Whitney," said Rainsford. "You're a big-game hunter, not a philosopher. Who cares how a jaguar feels?" represents a hint or suggestion about events that will occur later in the story. In this case, it suggests that Rainsford may soon experience a situation where he will need to understand how a jaguar feels in order to survive. This line foreshadows the dangerous and challenging situation Rainsford will face when he becomes the hunted rather than the hunter.