I presume that after Olivia started speaking with William Bell's voice, Peter immediately started crying and curled up in a fetal position. And now the rest of the Fringe team is involved, with Bellivia laid out on a stretcher while Astrid affixes electrodes to her... his? Oh, this is going to be annoying, I can see that already. You know what? Bell's a man trapped in a woman's body, so I'm just going to go with his own gender self-actualization and refer to Bellivia as him. And dear god I hope this doesn't go much more than an episode or two.
Anyway, Bellivia's saying that he understands their concerns, but Olivia's fine, simply resting. Unsurprisingly, Broyles would like a little clarification on that, and Bellivia explains that Olivia's conscious mind, her awareness, is in a state of rest. And this is exactly as he planned it: way back when Olivia first met him on the other side. "I gave her a cup of tea. The soooooul magnets were in that tea." So: soooooul roofies, then? Peter's standing there all grouchy, arms folded, as I imagine you would if your girlfriend, who you've FINALLY started having sex with, were to become inhabited with the consciousness of an octogenarian scientist who recently died.
I suppose to make sure that this isn't just Olivia pulling a big gag on everybody, Walter's checking out the brain's electrical activity. There are two distinct patterns he points out: "This one, active. That's you, Belly," he says, and he giggles, and so does Bellivia, while Astrid looks at Walter wide-eyed and Peter glares. "The other one inert. Like the brain waves of a long, dreamless sleep, which suggests that Olivia was aware of none of this."
Bell acknowledges that it might take some time to get used to. But hey, can't you see it from his side? Imagine how he feels! He never realized a bra was so binding! He starts snickering, and Walter laughs too, until Astrid gives him a subtle headshake, because the rest of the gang is unsurprisingly not made more comfortable about the situation by Bell talking about Olivia's breasts.
While Astrid takes the electrodes off, Broyles wants to make sure Bellivia's not making this a permanent arrangement. Bellivia says he just has to find a more suitable home to move to, and Olivia's brain can accommodate his consciousness for several weeks before anything would happen to her. Peter's all, "Weeks? Fuck that!" but Bellivia says he's confident Walter will find a stable home long before that. Twenty-four hours, forty-eight hours at the most, he says, and then he tells Astrid that she has lovely hands, which creeps her out terribly, and she withdraws them (but politely thanks him). Peter can't believe Broyles is seriously considering this, but Bellivia asks what they should do instead. "If I leave Olivia's brain now without finding a suitable host, I would die. And don't you think that my life is worth an extended nap?" Uh, can't your soul just go back to wherever it's been since your physical body died? Oh, no, because that would be ridiculous. Walter pleads Bell's case, saying William can help them understand Walternate's plan. Walter's like a kid pleading with his parents to keep a dog that followed him home. All Peter's interested in is getting Olivia back, and Broyles agrees to forty-eight hours to find a more suitable host: "Then I want you out of my agent. Or I'll have Dr. Bishop figure out how to drive you out. Agreed?" Bell agrees: "You have my word, young man." Peter doesn't look too happy about it, and quickly agrees to retrieve Bell's files from Massive Dynamic, specifically the one labeled re-entry.