There was obviously, definitely, another shooter involved: Stoneman Douglas High School student

http://stateofthenation2012.com/?p=94542

THE VIDEO OF THIS STUDENT HAS ALREADY BEEN 'MADE UNAVAILABLE' BY YOUTUBE!

IF YOU GO DIRECTLY TO THIS VIDEO ON  YOUTUBE IT SAYS...
'This video has been removed for violating YouTube's policy on harassment and bullying.'
AND JUST HOW DOES THAT REASONING APPLY?