The sound of the incoming tide was now very insistent, and little by little it seemed to change the old man's mood from maudlin tearfulness to watchful fear. He would pause now and then to renew those nervous glances over his shoulder or out toward the reef, and despite the wild absurdity of his tale, I could not help beginning to share his apprehensiveness. Zadok now grew shriller, seemed to be trying to whip up his courage with louder speech.