Final answer:
The foreshadowing sentence in the excerpt suggests that Doodle is no longer present in the narrator's life.
Step-by-step explanation:
The sentence from the excerpt that is foreshadowing is Sentence 4. It foreshadows that Doodle is no longer present in the narrator's life. The mention of the grindstone turning and time being ground away implies a sense of loss or absence. This sets the stage for the revelation that the narrator is remembering Doodle, suggesting that something significant may have happened to him.
Learn more about foreshadowing in literature