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enters the building. >> there are indicators that alexis was prepared to die during the attack and that he accepted death as the inevitable consequence of his actions. >> reporter: you can see him carrying his bag. hidden inside, a sawed off remington 870 which he removed in the bathroom. photos released show he left the bag behind. 22 minutes after driving in, surveillance picks him up. you see him move downstairs and make his way down another hall as people flee through a connecting hallway. in addition to seeing this chilling tape, we are are also getting a sharper picture of what drove alexis. >> there are multiple indicators that alexis held a delusional belief that he was being controlled or influenced by extremely low frequency or elf, electromagnetic waves. >> reporter: the fbi relieved