After the commercial break, we see the Loyalists stomp out of the lab and Astrid pops out of her hiding space in an air duct. She does that thing people do on television and in movies where as soon as the bad guys are off-camera, they pop out of their hiding space and stomp around like there's no chance anybody ever says, "Oh, hold up, guys, I forgot my phone" or whatever and comes back. She's got the amber laser with her and she heads back into the lab.
Meanwhile, Windmark is griping about how no one has been in that lab, and that the reading from the prisoner was deceptive. Broyles asks how that's even possible and Windmark turns on another little holographic device; this one is of Etta: "Somehow she hid her thoughts from us, deceived our readings. Perhaps others can as well," says Windmark. He does that head-cocking thing too, but just for a moment -- that thing where it seems like he might be reading Broyles.
But then we're off to the Penn Station checkpoint, where Walter pulls up in the hunk of junk station wagon and tells the Loyalist guard that he's trying to get to Kennebunkport, Maine, and the guard just scans him with a barcode reader-type thingy and asks to see his travel authorization.
Walter, unsurprisingly, plays a doddering old geezer convincingly enough that an Observer comes up to give him a mild electric shock to focus him a little bit but is not so threatening to suspect Walter's any kind of threat -- much to their woe, as Walter reaches beside him for his "travel authorization" and instead presses a gas mask to his face and then gives the Loyalist and the Observer a blast of the toxin that seals peoples orifices shut, suffocating them. Goddammit, I've only just gotten over my nightmares of what it looks like when people's mouths seal up. I'm not going to be able to sleep for weeks again!