While playing as Niobe, a woman runs past you when you first start. Run directly towards the railing and jump over it. Sparks will tell you to stay out of the lobby unless you want a fight. Fight the cops that enter the lobby then turn and go back to the side of the concourse that you started on. Make sure to stay on the ground floor and run towards the escalators. Turn left when you get to them and do not go up. Proceed across to the other side of the concourse and turn left around that corner. Somewhere in front of you or near you should be a man. If you go near him, he will start to run away. Follow him. He will keep looking back at you and will trip. He will run a bit farther, then stop, turn, and walk out the door of the terminal. You can follow him out before the door closes to get outside. You will see the SWAT van parked at the curb, and if you go around to the other side you can pick up an entry shotgun. There is really nothing else useful out there, but you can run around if desired.