One function of the Supernatural Aid is to guide the Hero to a certain place (physical) and a certain state (psychological). Once s/he has completed this task, s/he often disappears.
In A Fistful of Dynamite (1971), John dies at the end of the movie.
In Raging Bull (1980), Vickie leaves.
In Midnight Cowboy (1969), Ratso dies.
In Silence of the Lambs (1991), Lecter makes a final phone call to Clarice.
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