For a question (e.g. Does Susano have bad intentions?), an act was performed, with the vow that the answer would be in the affirmative if it produced a certain result, but in the negative if it did not.
ある事柄（例えば「スサノオに邪心があるかどうか」）について、そうならばこうなる、そうでないならばこうなるとあらかじめ宣言する。