At the end, the mermaid is given a choice of turning back into a mermaid by stabbing the prince in the heart and bathing her feet in his blood after he splits on her for somebody else.
This only increased my anger and, without thinking, I turned and put the knife's point deep into her heart! She fell to the floor and died without a sound.
The yards were hard up; and once more the Pequod thrust her undaunted bows into the opposing wind, for the supposed fair one had only been juggling her.