How does the author use foreshadowing in The Prestige?

When Angier and Julia reunite, her decision hinges on Angier's return to the stage. Her enthusiasm and the money needed for the venture prove to be a catalyst for the big event, which reignites the rivalry between Borden and Angier. This is foreshadowed by Julia's comments that she blames their marriage's failure on Borden...... his attack on her, and as a result, the loss of their child.