Jaws- Pursuit

But not now. The fin reappeared, still a football
field behind her, and he would have to wait until
it disappeared before he stopped...
...
The fin was back in their wake. It was a hundred
yards, perhaps a little more, astern of her. And
coming up, surely coming up.
...
But when he looked back he knew that they had
lost. The fin was closing fast. In seconds it was
towering above her.

- Jaws 2, Chapter 2