But my emotion was of short duration. I heard the sounds of a strong arm buffeting the waves, and I rowed in that direction. Amidst a luminous shower of spray and foam I discovered Rafael. Singular enough, instead of availing himself of his strength to gain the boat, he remained stationary. I quickly perceived the cause. At some distance from him, a little below the surface of the water, there was a strong phosphoric light; this light was slowly making way toward Rafael. Right well I knew what that light portended; it streamed from a _tintorera_[5] of the largest size. One stroke of the oar, and I was close to Rafael: he uttered a cry as he perceived me, but was too much exhausted to speak. He seized the gunwale of the boat by an effort of despair, but his arms were too wearied to enable him to raise his body. His eyes, though glazed with fear, yet bore so expressive a glance as they encountered mine, that I seized his hands in my own, and pressed them forcibly against the sides of the boat. The _tintorera_ still gradually advanced. For a moment, but one brief moment, Rafael's legs hung motionless; he uttered a piercing shriek, his eyes closed, his hands let loose their hold, and the upper part of his body fell back into the sea. The shark had bitten him in two. Ay! I might, perchance, have grasped his limbs too firmly in mine, possibly I prevented him from getting into the boat, but my knife was innocent of his blood; besides, was he not my rival--perchance my successful rival? However, scarcely had he disappeared than I plunged after him; for although the _tintorera_ had ridded me of a hated foe, still I bore it a grudge for its brutal proceedings in thus summarily disposing of poor Rafael. Besides, the honor of the corporation of divers was at stake. Having once tasted human flesh, the shark would doubtless attack us in turn. Well, nothing so much excites the ferocity of the _tintorera_ as such tempestuous nights as the one that bore its silent testimony to my rival's fate. A viscous substance that oozes from porous holes around the monster's mouth diffuses itself over the surface of the skin, rendering them as luminous as fire-flies, and this particularly during a thunderstorm. This luminous appearance is the more visible in proportion to the darkness of the night. By a merciful dispensation of nature, they are almost unable to see; so that the silent swimmer has at least one advantage over them. Moreover, they can not seize their prey without turning on their backs; so that it is not difficult to imagine that a courageous man and a skillful swimmer has some chances in his favor.