Over at the sheriff's office, Velchik is loading up his shotgun but good, along with the deputy, when Rose comes in to say that there's been too much bloodshed. "You got your boy back. Would you rather we'd let them keep him?" asks the sheriff, and Rose starts talking about killing innocent people and "real consequences" and the sheriff says there are real stakes here, which is why she's gotta let him do his job and keep the town safe. "And you think that killing those federal officers is the best way to put a stop to this?" she asks, and Velchik chillingly says it did the last time: "That federal marshal a few years ago, no one came looking for him, did they?" He says they've all got jobs to do, and her job is to "stick to the machine." The two men (the deputy has white hair like the freak who shot Pekarsky point blank) walk by her, leaving the office.
So Astrid asks Walter what kind of device they're looking for, and Walter says, "Any number of things could transmit the pulse," such as a large capacitor bank or some form of compression generator. There ya go ... just look for a "capacitor bank" or a "compression generator" and you'll find it in no time.
She asks about satellite dishes, because those are all over town, and Walter laughs at her and says, "Those are for television, dear. Given how little there is to do here, I imagine they watch a lot of it." So he manages to be condescending to Astrid and to the Edina hicks. That's nice.
To narrow it down for her, Walter wants Astrid to look for "something that could relay the discharge from the microwave conversion of large energy pulses." Would a big antenna work? Walter says it would, and Astrid points out the window. "Something like that?" There's a huge antenna behind Joseph's house. "Well done, Asterix," says Walter.
So their plan -- well, Walter's plan; Astrid is unsure -- is to just knock on the front door. A wooden plaque by the door identifies this as the home of Rose and Joe, and Walter says, "Rose. That was Edward's daughter. He used to carry her around the lab on his shoulders." I love how these little triggers help Walter remember things, especially since the pictures and drawings and reports of gruesome deformities in Edina didn't make him remember that he once consulted on an experiment THAT CAUSED GRUESOME DEFORMITIES IN EDINA.
Anyway, Teddy answers the door and looks suspiciously at Walter and Astrid. Walter asks the kid if his mother is rose, and his grandfather was Edward, and Walter identifies himself as a friend of Teddy's grandfather, and asks if they can come in. The kid nods, and the two of them come in.