In a divine dream, Hisayasu was supposedly given insight and was said to have attained enlightenment to the mysteries of the art of iai. Using this insight and the teachings received from his uncle he formed his own tradition of swordsmanship.
Hisayasu's journey involved receiving divine inspiration (a dream) that led him to understand the mysteries of iai swordsmanship. This understanding, combined with teachings from his uncle, formed the basis for his own distinct swordsmanship style.