Then it was revealed to Ioskeha by his mother's spirit that Tawiscara intended to slay him by treachery.

Therefore, when the brothers met, as they soon did, it was evident that a mortal combat was to begin.
Now, they were not men, but gods, whom it was impossible really to kill, nor even could either be seemingly slain, except by one particular substance, a secret which each had in his own keeping.

As therefore a contest with ordinary weapons would have been vain and unavailing, they agreed to tell each other what to each was the fatal implement of war.
Ioskeha acknowledged that to him a branch of the wild rose (or, according to another version, a bag filled with maize) was more dangerous than anything else; and Tawiscara disclosed that the horn of a deer could alone reach his vital part.
They laid off the lists, and Tawiscara, having the first chance, attacked his brother violently with a branch of the wild rose, and beat him till he lay as one dead; but quickly reviving, Ioskeha assaulted Tawiscara with the antler of a deer, and dealing him a blow in the side, the blood flowed from the wound in streams.

The unlucky combatant fled from the field, hastening toward the west, and as he ran the drops of his blood which fell upon the earth turned into flint stones.

Ioskeha did not spare him, but hastening after, finally slew him.