Ceasing his clamor he swam shoreward a dozen strokes and then paused again to splash and shout. Again and again he did this, and each time it was harder to make that deliberate pause. He was possessed by a panicky desire to speed ahead, trusting to his swiftness. Once he did let himself go and swam perhaps a score of strokes without stopping. When he finally forced himself to halt and glanced back over one shoulder, he seemed to glimpse under the water not a dozen yards away, a great gray-blue shape that struck terror to his soul. He splashed frantically and shouted hoarsely, and the thing slid away from his vision. But he knew it was there, lurking, waiting for a chance, and the remnants of his courage began to drain. Six strokes was all he dared to take now, and even those were halting and full of dread.