Olivia comes over to tell Walter they're ready, and Nina warns them that since the Observers analyze any change in the atmosphere, so once they use the technology, the Observers will respond within minutes. Olivia thanks her, and Nina wishes them good luck, staring hard at Walter. Yes, even you, Walter. Nina starts to cry after they go.

Downtown, Anil's scoping out a high-rise. Mueller rides up outside, gets out of the car and walks inside. Or maybe it's not Mueller -- three Observers, all carrying briefcases, converge in a boardroom several stories up and take their hats off, so you know this is serious business. Just as Anil is about to make a call, the Observers pop their briefcases...

...and there is an explosion that blows the window out, and then we see the Observers stumbling around in agony. Probably has something to do with their faces falling off, literally. A single fedora rides the cross-currents down to the street below, and plops there, filthy and ownerless. Hey, free hat!

Back at Formerly Kelvin Genetics, the team is setting up the sublimation equipment as Peter pulls in, right when Anil calls him, having figured out Peter managed to switch the briefcase: "It was a success. This place is crawling with Baldies," he says. There's certainly enough of them just standing in the street looking up at the building.

After Peter signs off, Olivia comes over to ask what Anil wanted, and Peter says he waited for an hour but didn't show, and that was just him on the phone calling to let Peter know he got stopped at a checkpoint. But, uh, no, he didn't tell me why he wanted to meet, Olivia, that's ridiculous! Olivia's getting even more suspicious by the minute.

So they flip on the sublimation device, which works as advertised, turning the rubble into so much smoke, revealing the door. Everyone is suitably impressed. They make their way into the building using flashlights, and then pull out some sort of machine that, I don't know, turns on the power or something. Walter pulls out Belly's hand and sticks it on the scanner, opening up the security door, and they continue inside, shining their flashlights through beakers and vials of unspeakable things.