A deliberately ambiguous picture. There are two choices, and every viewer must choose for his- or herself. Scenario One: The woman and the man were lovers, and when he was foully done to death, she took the knife that he had been slain with and vowed to use it upon his murderer--- it's revenge that she is after. Scenario two: The events described in Scenario One took place some time earlier, with the sole modification being that the man lying dead on the floor is not her lover, but the man who murdered him. Though she has fulfilled her vow, she feels no triumph, merely grief for all the happy endings that have died in the course of her adventure--- it's revenge that she has gotten. You may choose for yourself which tale is true, but no matter which it is, the sadness will remain, for her heart has been broken.