The process of emphasizing certain emanations…was discovered and practiced by the old seers. They realized that a Nagual man or Nagual woman, by the fact they had extra strength, can push the emphasis away from the usual emanations and make it shift to neighboring ones. This push is known as the Nagual’s blow.
The new seers employ the same technique, but instead of using it for sordid purposes, they use it to guide their apprentices to learn about man’s possibilities. (Fire, 110)