He was eventually detected in the very act of pushing a girl into the sea, jumping in after her, then turning into a shark, and commencing to devour her, to the horror of some people who were fishing with hook and rod from some rocks where he had not observed them. These people raised the alarm, and Nanaue seeing that he was discovered, left for Molokai where he was not known.
He took up his residence on Molokai at Poniuohua, adjoining the ahupuaa of Kainalu, and it was not very long before he was at his old practice of observing and accosting people, giving them his peculiar warning, following them to the sea in his human shape, then seizing one of them as a shark and pulling the unfortunate one to the bottom, where he would devour his victim. In the excitement of such an occurrence, people would fail to notice his absence until he would reappear at some distant point far away from the throng, as if engaged in shrimping or crabbing.
This went on for some time, till the frightened and harassed people in desperation went to consult a shark kahuna, as the ravages of the man-eating shark had put a practical taboo on all kinds of fishing. It was not safe to be anywhere near the sea, even in the shallowest water.
The kahuna told them to lie in wait for Nanaue, and the next time he prophesied that a person would be eaten head and tail, to have some strong men seize him and pull off his kapa mantle, when a shark mouth would be found on his back. This was done, and the mouth seen, but the shark-man was so strong when they seized him and attempted to bind him, that he broke away from them several times. He was finally overpowered near the seashore and tightly bound. All the people then turned their attention to gathering brush and firewood to burn him, for it was well known that it is only by being totally consumed by fire that a man-shark can be thoroughly destroyed, and prevented from taking possession of the body of some harmless fish shark, who would then be incited to do all the pernicious acts of a man-shark.
While he lay there on the low sandy beach, the tide was coming in, and as most of the people were returning with fagots and brush, Nanaue made a supreme effort and rolled over so that his feet touched the water, when he was enabled at once to change into a monster shark. Those who were near him saw it, but were not disposed to let him off so easily, and they ran several rows of netting makai, the water being very shallow for quite a distance out. The shark’s flippers were all bound by the ropes with which the man Nanaue had been bound, and this with the shallowness of the water prevented him from exerting his great strength to advantage. He did succeed in struggling to the breakers, though momentarily growing weaker from loss of blood, as the people were striking at him with clubs, spears, stone adzes and anything that would hurt or wound, so as to prevent his escape.
With all that, he would have got clear, if the people had not called to their aid the demigod Unauna, who lived in the mountains of upper Kainalu. It was then a case of Akua vs. Akua, but Unauna was only a young demigod, and not supposed to have acquired his full strength and supernatural powers, while Nanaue was a full-grown man and shark. If it had not been for the latter’s being hampered by the cords with which he was bound, the nets in his way, as well as the loss of blood, it is fully believed that he would have got the better of the young local presiding deity; but he was finally conquered and hauled up on the hill slopes of Kainalu to be burnt.
The shallow ravine left by the passage of his immense body over the light yielding soil of the Kainalu Hill slope can be seen to this day, as also a ring or deep groove completely around the top of a tall insulated rock very near the top of Kainalu Hill, around which Unauna had thrown the rope, to assist him in hauling the big shark uphill. The place was ever afterwards called Puumano (Shark Hill), and is so known to this day.
Nanaue was so large, that in the attempt to burn him, the blood and water oozing out of his burning body put out the fire several times. Not to be outwitted in that way by the shark son of Kamohoalii, Unauna ordered the people to cut and bring for the purpose of splitting into knives, bamboos from the sacred grove of Kainalu. The shark flesh was then cut into strips, partly dried, and then burnt, but the whole bamboo grove had to be used before the big shark was all cut. The god Mohoalii (another form of the name of the god Kamohoalii), father of Unauna, was so angered by the desecration of the grove, or more likely on account of the use to which it was put, that he took away all the edge and sharpness from the bamboos of this grove forever, and to this day they are different from the bamboos of any other place or grove on the islands, in this particular, that a piece of them cannot cut any more than any piece of common wood.