 Following the match, Shibata collapsed backstage and was rushed to a hospital, where it was discovered that he had a subdural hematoma, which required emergency surgery.Shibata's injury was similar to that which killed mixed martial artist Tim Hague a couple of months later.The injury was caused by Shibata's repeated use of a headbutt as a signature move, something he had been doing regularly since the summer of 2016.