Other source:

Hero tries to teach Yamcha as they battle, but Yamcha will hear nothing of it. Finally, after rebounding from Yamcha’s toughest attack, Hero ends the match with ease. Yamcha then thanks Hero for what he has taught him. Goku realizes that Hero is actually Kami in a human body. In the next battle, Tienshinhan and Goku seem to be of equal strength. But after an intense bout of sparring, Tienshinhan is panting while Goku breathes normally, seeming to have the upper hand.