We could see the monster turn on its back to seize its prey.  There was a snapping of jaws, and the sea around it was discoloured with blood. An involuntary cry of horror broke from us; then, to our surprise, we saw the man reappear, brandishing a sheath-knife, while the shark, in its last throes, floated belly uppermost, a skilful thrust of the knife having practically disembowelled it.