Perry Hall High School Shooting

"A shooting occurred at the Perry Hall cafeteria on the first day of school at 10:45 a.m., Monday, August 27, 2012. The shooter, suspected to be a 15-year-old sophomore student of the school, attended the first two classes and then went to the school restroom during break time where he allegedly reassembled a 12 gauge shotgun from his backpack and loaded it. He exited the restroom with the shotgun hidden under his clothing, and pulled it out in the cafeteria, where he fired a shot that struck a 17-year-old male student in the back, critically wounding him. A school guidance counselor immediately rushed the armed teenager and attempted to subdue him. More faculty members rushed the shooter, who fired into the ceiling during the struggle. Several people suffered minor cuts and bruises during the panic that ensued. Students were evacuated to a nearby shopping center and middle school"
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If you haven't seen the footage in this article it's quite interesting, he also mentions Columbine.
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Anyone have any thoughts on the videos?

Various other media reports are promoting bullying and mental health as a factor.