"A typical school shooter"

CNN gives information to understand the situation, that teachers and students were in with this (new) school shooter from Blacksburg (US) for at least two years. Mostly this words of a student. (After the class-reading of one of his plays: "Before Cho got to class that day" [last fall], "we students were talking to each other with serious worry about whether he could be a school shooter.") - And this video, in which the professor explains that she knew seriously, that he was a serious danger for the life of herself and her students: CNN.