Here's why:
* Grim Prediction: The chapter opens with Kevin (Freak) feeling unwell, experiencing dizziness and nausea. He even has a premonition that he won't wake up. This sets a somber tone and hints at a potential danger looming over him.
* Fearful Thoughts: Kevin shares his fears with Max, revealing his anxieties about dying young. This further emphasizes the sense of impending doom.
* Medical Uncertainty: The doctor's words, while not explicitly stating a fatal diagnosis, are ambiguous and leave room for interpretation. The reader is left wondering about the severity of Kevin's condition.
* Tragedy Foreshadowed: The chapter's ending with Kevin falling asleep and the subsequent scene of Max leaving him alone to rest, creates a sense of unease and anticipation.
The foreshadowing in Chapter 15 effectively builds suspense and prepares the reader for the tragic events that unfold in the later chapters.