mr. pickett.s stops and the bus door opens and she exits. >> the call is to her friends now waiting at her stop. she told them about her confrontation with mr. pickett. and they are armed and ready for action. >> it looked like at first he was helping her get off, but i noticed when he, like, seemed to grab her, i knew something was wrong. >> septa security footage captures exactly what's wrong in stunning detail. >> as she's exiting, another young man is coming toward the bus and she says something to him. from what the prosecutor said, she pointed out mr. pickett and said i want you to shoot that guy. >> as the mom and her son get off, one man goes in the front door and gestures for everyone to come to the front steps. meanwhile, his friend is busy pulling out a huge rifle he's had hidden down the leg of his pants. soon he's joined by the man at the front of the bus who pulls out his own semiautomatic weapon and they open fire. >> just absolute pandemonium in the bus. and these people are terrif