Walter turns off the electronic barrier while the remaining Fringers climb out of the trunk. The women take the car around back, while Peter and Walter stroll into Penn Station, surprisingly unmolested because I guess nobody saw the guards suddenly fall over and die.
Inside, they stroll past a Loyalist guard who seconds later gets an alert that there's been a checkpoint breach. The Bishops head down onto a disused platform where Walter shines his flashlight around until he finds a brick column with "Kilroy Was Here" scrawled on it. That's the one, he says. "'Kilroy'?" asks Peter, like it's not hip enough graffiti for him. They pull off the air vent and yank out the heavy tube stashed inside, and we should probably be concerned about the approaching footsteps we're hearing.
Speaking of danger sound-effects, Olivia and Etta are waiting in the car outside and I guess it's a really tight budget this season because we don't see any kind of checkpoint kerfuffle; we just hear sirens and doors slamming and people yelling. "Let's go," says Olivia, and they get their gas masks on and get out of the car.
Inside, Walter and Peter are getting ready to go when the Loyalist guard shows up. Peter shoots him, as he does the Observer that pops into view. Outside, Olivia and Etta are now drawing fire from the guards, but they use Walter's special guns to launch some toxin canisters and it's not long before the sentries are clutching at their throats while dying horrible, horrible deaths. Guess Olivia's gotten over her "Loyalists are people too" hang-up.
Peter and Walter shoot their way outside (well, Peter does, anyway) and into the awaiting car, and then the team peels on out of there, shaking off one final Loyalist who latches onto the station wagon but then falls off, suffocating like the rest -- only he's clutching some sort of device in his hand that's conspicuous by its presence.
After the commercial break, we're over to Manhattan, where Broyles is typing on a laptop that he then sticks in his bag. Looking over his shoulder, he then pulls out an old faded picture of Peter and Olivia and stares at it for a moment.
Meanwhile, the team has managed a clean getaway and have pulled over under a bridge, where they pull the plans out of the heavy tube and unroll them on the hood of the car. It's a huge formula covering every inch of a massive piece of paper, but Walter can't make head or tail of it: "It's some kind of physics. It's beyond everything I've seen. I don't understand," he says. Olivia points out that it's in his handwriting, so even if it was wiped from his mind, he understood it at some point. Walter suggests it may have been dictated -- perhaps by September, as Peter suggests -- and he gets snappy with Etta when she asks if he'll be able to figure it out. "This is Greek to me, except that I read Greek. This is Aramaic to me," he says. Except not the Western dialect, because he does speak that a little. Heh.