So now Walter's on the phone explaining it to Peter, whose head mysteriously doesn't explode as Walter "explains" that someone must have perfected the military's camouflage technology to hide the deformities. As long as they stay within range of the pulse, then everyone appears normal. "So that's the Edina hum. That's the sound that the pulse makes," says Olivia, who asks Walter if he knows who could have perfected this technology. Merlin? "Edward Cobb was the scientist who dreamed up Project Elephant. He would be the only one with the imagination and the know-how," says Walter. Peter wants Walter and Astrid to head back home: "Someone obviously has a lot invested in keeping this thing a secret. They've killed three people already; they tried to kill us. I don't want to have to worry about you." Walter says that's very sweet of him, and Peter says he'll see Walter back at home.
Astrid -- who I'd like to point out is an FBI agent and not actually under Peter's command (for that matter, neither is Walter) -- asks what Peter said. "He wants us to head into town to try and find the source of the electromagnetic pulse," says Walter. Heh. Go get 'em, Walter.