It was originally believed that Gou had been killed by Rio, but he he used an imperfect form of the forbidden Gekiwaza in an attempt to defeat Rio as the Kensei had done to seal the Kenma long ago.
It was originally believed that Gou had been killed by Rio, the two original students under Sha Fu as well as best friends. But in truth, Gou used an imperfect form of the forbidden Gekiwaza in an attempt to defeat Rio as the Kensei had done to seal the Fist Demons long ago.