Rooftop shootout! Rooftop shootout! Everybody do the rooftop shootout! That's a song I'm writing about this rooftop shootout. It's going to need some dance moves, I think. Something about leaning one way and then another. For a long, long time.

Vicky and her hostage security guard finally get to the Security Control Room and see that other guard lying on the ground. The guard who's alive goes over to push the "Evacuate the Mall" button, but he warns that it'll probably take 20-25 minutes. She asks if there's a way to shut off the air circulation system, and he says there is! But he doesn't know how to do it. Too bad she didn't bring along that blueprint with all the air duct information!

Down in the mall, people leave in an orderly fashion.

The rooftop shootout continues to be boring. Beardo runs out of bullets, so he reloads his gun. Sean also runs out, but he has no more ammunition. So he sneaks around behind Beardo and whops him over the head with his pistol. They fight! This time, the fight takes the form of rolling around on the roof. Downstairs, Vicky yells at people to hurry up and runs up to the roof. Alex finally sets the countdown timer on her doohickey to "3:00" and runs off. Vicky sees Sean and Beardo struggling. Beardo gets his gun pointed at Sean's chest, and there's a gunshot! Obviously, Sean wasn't shot. Vicky killed Beardo. Sean and Vicky establish that Alexis is gone, but her beeping countdown thing is at 2:46 already. Sean says, "Looks like a pressurized tank that's connected to the air recirculating system." Oh, sure. One of those.

Sterling and Simon drive up to a warehouse. Simon gets out and walks up to the big doors so he can drive the car inside. The warehouse is empty. In the Situation Room, that one general shows the warehouse to Jarvis via the magic of real-time satellite feeds. Peel is skeptical that Jarvis really has information about this, especially because Jarvis won't tell him who Sterling and Simon are meeting with. He tells the tactical team to stand down, which I guess means there was a tactical team down there. He's coordinating directly with the Air Force, which I'm surprised no one else in the room knew about. He's going to use a Predator Drone. Ripped from today's headlines! He announces that they're a country at war and that these men are traitors. I guess he forgot already that he said last episode that the country is no longer at war with the aliens. Oh, and that thing about people deserving a trial. The general refuses to condone blowing up the warehouse, and Jarvis tells him he can get the hell out. He does! The drone is in position. Peel says that this is an assassination. Jarvis tells the Air Force to fire when ready.