How does the author use foreshadowing in He?

Mrs. Whipple's stream-of-conscious self-pity underlines how closely she too connects her son to the pig. Reviewing her feelings about the pig, scraped pink and naked, triggers the thought of Him. The link between the butchered pig and Him is thus too obvious to overlook: both make her sick. We may deduce that when she cut the pig's throat she was also thinking of Him, and that this confused lamentation is partly an effort to propitiate her conscience, to prevent it from accusing her of the wish to murder. We recall the similar action of another Porter character with a death wish, Maria Concepcion, who soon after she discovers her husband's infidelity, selects a chicken for the archeologist Given and "silently, swiftly drew her knife across its throat, twisting the head off with the casual firmness she might use with the top of a beet." Givens is unnerved by Maria's cold-bloodedness, but her resoluteness here is an explicit foreshadowing of her later bloody revenge.