So the young man started out to search for his uncles. After a time he came to a high hill, from the top of which he saw a little old tipi. He went up to it and looked in at the door. He saw a very old woman in-side. When the old woman saw him she said, "Come in, my grandchild; come in and break my ribs."

As the young man entered, the old woman stooped over toward the ground, and the young man kicked her with his foot until all her ribs were broken. At last, as he kicked, one of the ribs turned inward and pierced the old woman's heart. This killed her. Looking around inside the tipi, the young man saw the skeletons of many people. These were killed when breaking the old woman's ribs, because the last rib when broken turned outward and pierced the heart of the kicker. But this young man, who was called the Stone Boy, could not be killed in that way.

Some Dakota Myths II, p. 201