On April 20th of that year, just like any other day, Yeh Yong-chih raised his hand to exit music class to the restroom. However, after that moment, he never returned. He was discovered lying in a pool of blood(被發現躺在一灘血中). The subsequent(隨後的；接下來的) forensic examination(法醫檢查) indicated that he likely slipped in the restroom, resulting in a fatal(致命的) head injury. If Yeh Yong-chih hadn't been subjected to(受到了；經歷了) bullying, it's highly probable that he wouldn't have been left alone, injured, and without assistance in the restroom during class time.