That same year, Kazuya confronted his father after learning of his mother's death, but he was defeated almost immediately by him. Heihachi proceeded to throw five-year-old Kazuya off a cliff.[13] Heihachi claimed that his son was weak and would have to survive and climb back up if he was to be his true heir and successor.[14] Heihachi later revealed he also wished to test if Kazuya had the supernatural ability to survive the fall, fearing he may have the same 'illness' as his mother.[13]