Over there, Olivia and alt-Broyles arrive at Harvard and get into Walter's lab. Olivia pulls the cover sheet off the sensory-deprivation tank, which appears to be empty. Fortunately that doesn't appear to be the insurmountable obstacle it was on Liberty Island. She fills it up with a hose, making sure to include bags of rock salt, while Broyles readies a Cortexiphan injection.
But just as Broyles is helping Olivia into the tank, they hear the sound of agents storming the halls of Harvard. Olivia's all "What the!" and Broyles tells her that he's got a subcutaneous tracker -- he shows her the lump on the underside of his wrist. Yeah, NICE OF YOU TO MENTION THAT BEFORE NOW. He finishes getting her into the tank, telling her that he has to "believe in hope. Please make this worth it."
So she gets in, and the doors are closed, and we hear muffled shouting and a shout and someone shouting that Broyles is under arrest, and "she's in the tank!" etc., and all I can say is NICE SENSORY DEPRIVATION TANK, but it seems to work because Olivia closes her eyes and then she kind of jerks them open.
And then we're in our universe, with Astrid puttering around in the Harvard lab. She's shocked to see Olivia climb, dripping wet, out of the sensory deprivation tank, and she drops the beaker she's holding. And then Olivia collapses, so it's not all good news.
Over at non-Springsteen Station, Broyles is ordering up a three-car half-mile buffer zone all the way to Boston, while Fauxlivia sits in the back of a prisoner transport truck.
Meanwhile, Walter examines the little rod thingies that were in the injection gun, and says they look familiar, and the huge digital clock on the wall of non-Springsteen Station behind him changes from 3:59 to 4:00.
Inside the paddywagon, Fauxlivia's hands start to glow an orangey-red. Outside, Walter's tapping the pin on a hotdog vendor's cart and holding it to his ear. "E-minor. It's pretty," he says. I second that; I don't know why, but E-minor is my favorite guitar chord. Maybe because it's easy to play yet sounds cool? Anyway, Broyles has the not-insignificant news from Astrid that Olivia crossed over into Walter's lab, but they think she had a seizure and she's on her way to Boston General. Peter's managing not to flip out too badly, but it seems like none of this has even really registered with Walter, who's still listening to the rod.