How does the author use foreshadowing in Sweet Bird of Youth?

In Act I, Scene I, Scudder tells Chance that his mother recently died and was buried, and that something has happened to Heavenly. Scudder had tried and failed to contact Chance about these matters. Scudder also warns Chance that he had better leave town before Heavenly's father and brother come after him, foreshadowing their intent to revenge Heavenly's health problems, which were caused by Chance.