After the ads, Walter is doing a preliminary post-mortem. He observes that Leeder's body is warmer than it should be, which seems to remind him that they left the oven on in their apartment. This is clearly not the first time Walter has made claims like this since they arrived, as Peter assures him, rather impatiently, that everything's under control back home. He asks why Walter's been acting weird since they arrived. Before Walter can answer, the coroner walks in with the bloodwork. Which Walter correctly predicts the contents of, because he can tell from the hair and the dehydration lesions on the body that Leeder died of "acute exhaustion." The M.E. says humans can't die of that (let's see him recap four episodes of 24 in a week sometime, then), but Walter insists that just because it hasn't, that doesn't mean it couldn't. In fact, it's happened in rats before. Walter asks for the body to be shipped back to his lab in Boston, which Peter tries to shut right down. "Whatever you need, I'm sure they have it here," he insists. So then Walter has a little sidebar with Peter, telling him he needs to go home. "This city has a smell. It's wet. It reminds me of St. Clare's. The mental institution where I live." And Fringe would like to thank the City of Seattle, the entirety of which it just accused of smelling like a loony bin. Walter pathetically begs to go home, telling Peter to stay and help Olivia. Peter takes pity on his dad and says, "We'll find someone to take you home." How hard could that be? We haven't seen Agent Jessup in a few episodes, have we?
Later, Walter's leaving the hospital with the body about to be loaded in the ambulance. Peter watches as he briefs the fresh-faced young agent who's apparently been assigned to accompany Walter back to Boston. "Buddy, I've been with the Bureau for three years," the rookie boasts. "Flying your father home shouldn't be a problem." Peter pretends to agree, and gives him a few tips. "You want to keep his Sudoku pad handy. There's also a copy of Max Planck's book on entropy in his backpack that should keep him busy for a couple hours. And whatever you do, under no circumstances let him drink." Because, you know, of the psychotropic drugs that are in Walter's system at any given time. The agent looks like he's starting to take this seriously for the first time. And since he's being played by Keith from Scrubs, you just know there's a thorough screwing-over in his future.