1　案　情某男 ,18岁 ,于某日晚 19时许 ,手持剌刀到某学校二楼教室与学生打架 ,剌刀被某学生抢下后 ,便逃出教室 ,当跑到走廊楼梯口时 ,被后面追赶来的学生用剌刀从左后腰部剌入 ,伤者继续从二楼跑到一楼并跑出教学楼 90ｍ处倒地身亡。2　尸　检死者背部脊柱偏左 10ｃｍ处的第 A case of a male, 18 years old, at about 19 o’clock one night, armed with a knife to a classroom on the second floor of a school and students fight, the knife was grabbed by a student, they escaped from the classroom, when ran to the corridor stairs , Was chased by the back of the student with a bayonet from the left rear waist assassination, the injured continued to run from the second floor to the ground floor and ran 90m from the school building fell to the ground. 2 autopsy dead back spine 10cm left at the first place