His every muscle tense, he waited impatiently for the next flash. The instant it had come and gone, he began to edge backward, slowly, silently, with infinite care, over the wet, yielding sand. It took a long time to worm past the length of the canoe, but after that he made better progress. At length, a hundred feet or more from the end of the point and on the opposite side, he rose to his feet and hurried along the beach toward the mainland.