So he trod on Iyas chest and Iya's breath rushed out of his mouth and nostrils like a mighty wind and it whirled and twisted, breaking down trees and tearing up the grass and throwing the water from the lake and even piling the rocks and earth over the carcasses of the coyote and snake tree so that the Thunder Bird came rushing through the air to know what all this tumult was about and with his cloud shield, he rushed into this great whirlwind and roared and flashed the lightning from his eyes and fought the whirlwind and carried it away into the sky.

Lakota Myth, p. 152-153