Sharks in water already before they is shot.

We say then it no sharks they shot.

Now we say it must been--" The captain turned away.

He did not want to hear any more.

There was no possible escape from the belief that Rynders and all his men had been shot down, and robbed, if they had anything worth taking, and then their bodies carried out to sea, most likely in their own boat, and thrown overboard.
There was nothing more at this dreadful place that Captain Horn wished to see, to consider, or to do, and calling the negroes to follow him, he set out on his return.
During the dreary walk along the beach the captain's depression of spirits was increased by the recollection of his thoughts about the sailors and the treasure.