Instantly he swam with all his might toward the reefs, shivering as he went.

When he drew himself up on the slippery rocks he did not see the formidable fin.

He was quite willing to utter devout thanks aloud.

It might not have been a shark, but it made him remember they were to be expected in those waters.

After that he took no chances, bathing inside the reefs and going outside in the dinghy only.
A few days later he was upon his highest hill watching the horizon when he saw a dark spot appear in the southwest.