Participation in the dance was entirely voluntary, a mental vow to worship the Mystery in this manner being expressed by a man ardently desiring the recovery of a sick relative; or surrounded by an enemy with escape apparently impossible; or, it might be, dying of hunger … since some inscrutable power had swept all game from forest and prairie. Others joined in the ceremony in the hope and firm belief that the Mystery …would grant them successes against the enemy and consequent eminence at home.