What metaphors are used in For Your Eyes Only by Ian Fleming?

Metaphor:

"Inside the reef, who was the predator in the world of small fishes? Who did they fear? Small barracuda? An occasional bill-fish? Now, a big, a fully grown predator, a man called Krest, was standing in the wings, waiting. And this one wasn't even hungry. He was just going to kill—almost for fun."