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Horrific, horrifying video. cnn law enforcement analyst art rod rick is here. chris we can either is here as well. hes former fbi assistant director for the criminal investigative division. art, you first. what stands out with this video as you watch what happened. >> its absolutely harrowing video, but it seems to cover the whole nine to ten minutes that this individual is shooting and you can see that there was breaks in the shooting. now, whether that means hes moving from window to window or...