A video camera, which is supposed to be monitored by two guards in a command post, shows the two arriving in the holding area between two courtrooms, according to a law enforcement official who viewed the tape. The video shows Hall guiding Nichols, whose hands are still handcuffed behind his back, face-first into one of two open cells. Hall releases one cuff and turns Nichols around to unhook the remaining cuff, which is dangling from his wrist. She uncuffs him so he can change from a jail jumpsuit into street clothes. The muscular, 33-year-old Nichols then lunges at Hall, knocking...