After the commercial break, the guard is getting angrier with Olivia, who totally takes it out on Astrid. Peter stares at the paper. "Walter, what is this?" he asks, and Walter says, "How do I know? You saw it, not me."
The guard yells at Olivia some more. "He seems rather irritated with you," says Jones. "Astrid, please! I have no time!" shouts Olivia, like maybe Astrid isn't AWARE of the urgency of the situation.
Peter, still looking at his sketch, says there's something missing. Walter's all, duh, horizontal lines. He says there's literature on misrepresentation of horizontal space due to brain damage. While Jones makes a tick-tock sound at Olivia with his tongue, Walter tells Peter that the bullet may have destroyed the part of Smith's brain that helps him process horizontal lines: "We are going to have to fill in the blanks." Peter stares at the paper, and then starts drawing, looking like he's doing it on instinct.
Meanwhile, the guards are actually forcibly removing Olivia from the room. But Peter's finished, and after adding lines to the top, middle and bottoms of some of the lines, his paper now says "Little Hill." Good thing there were no X's or O's! "Little Hill!" he yells. "Little Hill?" says Astrid. "Little Hill!" yells Olivia, practically digging grooves in the floor with her fingernails as the guards haul her out of there. Jones looks up, somewhat surprised, then says, "Three parts mebendazole. Two parts thermophilic hydrolase. A syringe directly into the parasite." Fortunately, it appears that Walter's got all this stuff at hand, because at this time of night, the only place that's going to be open is 7-Eleven, and they really jack up the price on their thermophilic hydrolase.
Walter injects the parasite, and immediately the roots in the IV line start to wither. Samantha says, "Does that mean ... is Mitchell gonna live? Is he gonna be OK?" Walter says he thinks so, and Broyles thanks him.
Lucas rides with Olivia out to the airport, and she tells him Jones asked her a question about loyalty, and something about the way he said it, it felt like he knew something, maybe about betraying the Bureau. Lucas tells her he has other means of gathering information about Jones. "If you'd like me to use them ... say yes, Olivia. It'll give me an excuse to call you again." Olivia smiles. I think she needs to give Lucas a reason to keep it in his damn pants for once.