For an instant he came close to screaming wildly, to beating the water with that mad frenzy which comes to drowning men. But just in time his teeth dug cruelly into his under lip and he jerked himself back into a semblance of sanity. And then he began to shout and beat the water, but with a set purpose. Noise was what the creature dreaded. He could not hope to outswim the monster, but in this fashion he might hold it off till Cavanaugh was safe, and perhaps himself.