How Did She Learn the Flying Thunder God?

After watching Might Guy and Neji Hyuga's battle through the crystal ball, Hiruzen Sarutobi, Danzo Shimura, Homura Mitokado, and Koharu Utatane in the Hokage's Office fell silent. The Hokage's Office was shrouded in silent contemplation. They were not surprised by Might Guy's strength. Might Guy's ability to become a Jonin who relied purely on taijutsu began with his father, Might Duy. Might Duy had actually been a Konoha Genin, mainly handling menial labor for employers, helping them find cats, and other Genin missions.