I think that Reverend Hale is a character who is motivated by the relationship shared by Proctor and Elizabeth. He recognizes that his desire to save those who are condemned can be aided if Elizabeth can persuade John to confess. Hale understands this because he recognizes the strong relationship between Elizabeth and John. His desire to act in the end of the drama, specifically towards John, is a result of his observing and being motivated to use the relationship between Elizabeth and John. Though it might be awkward to suggest, I think that Abigail is motivated in the end to flee Salem, in part of because of the relationship between John and Elizabeth. Her desire to claim John for her own stems from the basic idea that the marriage cannot be saved. Yet, when it becomes evident that John is willing to take the fall to save Elizabeth and still refuses to acquiesce, a major reason for Abigail initiating the trial has gone asunder. It is never really known, but a part of Abigail's reason for living has to be due to the fact that she could never pry apart Elizabeth and John. In both of these intances, the relationship of Proctor and Elizabeth serves to motivate characters in Miller's work.