The stranger did not realize that he was pursued until Sumner had shoved off from shore, and was urging his own craft forward with vigorous strokes of his double-bladed paddle. When, by a glance over his shoulder, he discovered this, he redoubled his efforts to escape, and by his clumsy splashings proved himself a novice in the art of paddling. Still he made fair headway, and it was not until they were several hundred yards from shore that Sumner overtook him.