How does the author use foreshadowing in The Browning Version?

The course of The Browning Version is changed by two key symbolic acts, both of which involved the young student, Taplow. In the beginning of the play, he arrives for his tutoring session, only to find that Andrew is late. To get rid of the boy temporarily, Millie sends him to the pharmacists to pick up Andrew's heart medicine. He completes this task, which foreshadows his role as catalyst for Andrew's rebirth.