The security guard, Jesus Campos, was struck in the leg as the gunman, from behind his door, shot into the hallway on the 32nd floor. Paddock apparently detected Campos via surveillance cameras he set up outside his hotel suite, police have said. Paddock shot the guard at 9:59 p.m. local time, Lombardo said, shortly before raining down bullets on the Route 91 Harvest festival in an attack that began at 10:05 p.m. and lasted 10 minutes. Police officers found Campos when they arrived on the floor. And Campos did not summon police to the 32nd floor of the Mandalay Bay hotel, according to the timeline recently updated by the authorities.