The story itself is about how the Lakota people came to have horses... not in recent times, but long ago. A very long time ago. A young Lakota man sees them and spends time away from his village, taming and training them. He brings them to the village, where nobody has seen them before. They learn to use them to make life easier, but they also use them in aggressive actions on other tribes. That is an abuse of them as a gift of the Creator, so they are taken away. Of course, we know they come back... much later, when Europeans arrive.