mobley waits for the perfect moment to switch positions. >> tracy mobley was the ring leader in this.e was no doubt she was the one who came up with the idea because she had a felony hanging over her head. and mary morrissey was just here for misdemeanor traffic things for which she probably would have gotten a fine. >> after their disappearing act, a full five seconds ticked by before a sheriff's deputy appears in the loading area, but he doesn't seem to notice anything's amis. >> doesn't somebody watch the video while the prisoners are going onto the bus? don't they do a beginning count when they start to go out? don't they do an ending count on the bus? then they would have known they were short two prisoners. >> oblivious that two prisoners are underneath the bus instead of inside it, the bus pulls out onto the street. officer morris just happens to be standing steps away. >> he was pulling out exactly the way he is now, with prisoners aboard like he has right now. pulled out, made it to probably just about right there. >> incredibly, the prisoners cling to the underside of the bu