That night Ka-moho-alii came to the beach black with lava sand, crawled out of the water, and put on the form of a man. As a mighty chief he walked through the valley and mingled with the people. For days he entered into their sports and pastimes and partook of their bounty, always looking for the beautiful woman whom he had seen bathing in the surf. When he found her he came to her and won her to be his wife.
Kalei was the name of the woman who married the strange chief. When the time came for a child to be born to them, Ka-moho-alii charged Kalei to keep careful watch of it and guard its body continually from being seen of men, and never allow the child to eat the flesh of any animal. Then he disappeared, never permitting Kalei to have the least suspicion that he was the king of the sharks.
When the child was born, Kalei gave to him the name "Nanaue." She was exceedingly surprised to find an opening in his back. As the child grew to manhood the opening developed into a large shark-mouth in rows of fierce sharp teeth.
From infancy to manhood Kalei protected Nanaue by keeping his back covered with a fine kapa cloak. She was full of fear as she saw Nanaue plunge into the water and become a shark. The mouth on his back opened for any kind of prey. But she kept the terrible birthmark of her son a secret hidden in the depths of her own heart.
For years she prepared for him the common articles of food, always shielding him from the temptation to eat meat. But when he became a man his grandfather took him to the men's eating-house, where his mother could no longer protect him. Meats of all varieties were given to him in great abundance, yet he always wanted more. His appetite was insatiable.
While under his mother's care he had been taken to the pool of water into which the great Waipio Falls poured its cascade of water. There he bathed, and, changing himself into a shark, caught the small fish which were playing around him. His mother was always watching him to give an alarm if any of the people came near to the bathing-place.
As he became a man he avoided his companions in all bathing and fishing. He went away by himself. When the people were out in the deep sea bathing or fishing, suddenly a fierce shark would appear in their midst, biting and tearing their limbs and dragging them down in the deep water. Many of the people disappeared secretly, and great terror filled the homes of Waipio.
Nanaue's mother alone was certain that he was the cause of the trouble. He was becoming very bold in his depredations. Sometimes he would ask when his friends were going out in the sea; then he would go to a place at some distance, leap into the sea, and swiftly dash to intercept the return of his friends to the shore. Perhaps he would allay suspicion by appearing as a man and challenge to a swimming-race. Diving suddenly, he would in an instant become a shark and destroy his fellow-swimmer.
The people felt that he had some peculiar power, and feared him. One day, when their high chief had called all the men of the valley to prepare the taro patches for their future supply of food, a fellow-workman standing by the side of Nanaue tore his kapa cape from his shoulders. The men behind cried out, "See the great shark-mouth!" All the people came running together, shouting, "A shark-man!" "A shark-man!"
Nanaue became very angry and snapped his shark-teeth together. Then with bitter rage he attacked those standing near him. He seized one by the arm and bit it in two. He tore the flesh of another in ragged gashes. Biting and snapping from side to side he ran toward the sea.