Fear is etched on Walter's face as he swirls Peter's sample and holds it up, fingers trembling. Olivia watches from behind. The relief on Walter's face and his struggle to keep his voice from cracking as he tells Peter that he's OK almost made me cry, especially knowing that Peter's infected. Peter quickly orders a group to come downstairs with him.

Downstairs, the first group of uninfected (and Peter) file their way outside the doors guarded by CDC guys with guns. They check the names of each of the office workers as they walk outside, with Olivia just in front of Peter. She walks through, and then turns, smiling, to look at Peter just as one of the CDC thugs notices Peter's nosebleed. They grab him, as Peter's veins start to constrict and he lunges for the door, at Olivia. "I just have to get outside!" he yells.

Back upstairs, a man's sample turns black. "But I wasn't near anyone," he says. "Steve, you need to come with me," says Detective Kassel. Nice of him to show up. Where is he when people are throwing themselves out windows? Walter looks perturbed. He ain't seen nothing yet.

His son, downstairs, is pounding on the glass and yelling for Olivia to open the door. "Peter, I can't. You know that," she says. And Peter, looking like he's on heroin, tries to look as cheerful and normal as possible before he gets angry again, and runs off somewhere in the building.

After the commercial break, Det. Kassel is being cleared by Walter, and he's the last one. Astrid calls Olivia to tell her they finished the tox screens, and Olivia tells her about Peter: "The test was wrong. I, I don't know how, but... but he's bleeding from his nose and he's still in the building." Astrid's too shocked to say much more than "OK," and she hangs up and Walter asks, "What was that about Peter?" We don't get to see him react to the news.

Meanwhile, McFadden is telling Broyles that the Cambodian outbreak of 2004 killed 7,300 people, which could have been avoided if the Chinese authorities had moved quicker. "That was Level Four. This is classified as Six. Right now, it's the only option," he's saying. It sounds somewhat disingenuous for him to say "it's being classified as Six" when really he ought to say "I've classified it as Six" but the point is he's a suit who has to make tough decisions, right?

Olivia comes in to tell Broyles that the tox screens are finished, and McFadden already knows: "Eleven civilians infected, and your colleague. I'm sorry." Olivia asks what they do now, but she's not going to like McFadden's answer: "Extract the rest of the ones that tested negative, and the State department has authorized us to have the Army move in and contain the rest." Olivia's all, "'Army'?" and Broyles can see this going south in a hurry, but Olivia takes no notice of his warning "Dunham" as Olivia snaps, "There are still a dozen people in that building. You cannot tell me that killing them is our only option."