Olivia and Peter are in some big dude's AV lab, playing back the last few seconds of surveillance tape from before Officer Gillespie went to pieces. They spot Gillespie, but no bomb, seconds before the picture goes snowy. "I told her you were a genius, Joe," Peter protests. "Don't prove me wrong." Joe suggests a smarter genius, because all he can think of is that radio wave interference might have wiped that part of the tape. Looking at the time code on the screen (which I'm glad to see doesn't directly contradict the analog clock we saw earlier), Peter points out that the bomb went off twenty seconds after the static cut in. "So why did we lose picture before the explosion?" Olivia wonders. Good question. If by "good" you mean "boring."
Peter returns to the lab, asking Walter if he has any theories. Walter's response is typically elliptical, in the form of a reminiscence about a puzzle they put together when Peter was a kid. "Putting together a jigsaw of a nude centerfold was Walter's idea of how to explain, what was it, human reproduction? To his ten-year-old son," Peter chuckles to Astrid. From what I've heard, Peter should have been grateful that Walter found the time to help him with all five hundred pieces. Peter asks what this has to do with Gillespie, as if it weren't obvious, so Walter leads him over to another workbench, where he has apparently been busy reassembling the hapless officer. "Fantastic," Peter says, looking at the vague humanoid outline, some partial extremities, and the beginnings of a face on a stand. "Apart from the obvious, anything out of the ordinary?" Walter tells Peter to have a look at the multiple needle marks between the reassembled toes, a sign that something was being injected into Gillespie's bloodstream. "From his tissues, it appears to cause a chemical reaction on the cellular level that both solidifies the water in his cells and emitted massive energy, which shattered the body." Yeah, I hate when that happens. Peter asks if Gillespie did this to himself on purpose. "I stopped counting at 47 needle marks," Walter says. "I can't imagine it was an accident." The conclusion: Officer Gillespie wasn't wearing a bomb; he was one. Okay, now they've caught up.
We're still focused on Gillespie's 3-D puzzle face when we hear his wife start speaking, so for a minute it seems like she's there looking at him. But no, Olivia and Peter are at the Gillespie home, listening to his widow making the usual widow speech, which includes a reference to Gillespie's two tours in Iraq and their plans to start a family. Peter asks a pretty basic question about Gillespie's time there, but that causes the widow to ask if Peter served, in turn giving Peter a chance to remind us for later that he was a "civilian contractor based out of Baghdad." Olivia asks Mrs. G. if her husband was on any meds, and as the wife answers that he was fine, she doesn't notice that Olivia starts to pick up her mug but puts it down again when her hand starts shaking. Peter does, though, and a moment later, Olivia's hand goes to her head. There's a single-frame, red-tinged flash of something like an elevator readout as Olivia gets up to stumble to the bathroom, suffering flashes the whole way. A corridor. A finger pressing an elevator button. The Twin Towers, still very much erect. An extreme, upside-down close-up of William Bell's mouth emitting a tiny fraction of a word. Olivia in the elevator with a bunch of science types. Bell breathing from an oxygen mask. Another Bell-flash. All of them are shot through a red filter, as though they all occurred in the Brady Bunch's darkroom. By now, she has just made it to the toilet in time to retch in it. From this position, as she lowers the lid and flushes, she just happens to notice a loose tile in the wall under the pedestal sink. Way to accidentally stumble on a crucial clue, Olivia. She removes the tile, and reaches in to pull out a black plastic case about the size of a shaving kit. Inside are numerous vials of some red-orange liquid, and another case with a large syringe inside. Peter taps on the door, asking if she's okay. Dude, she just got there. Give her a minute. Instead of answering, she comes out into the hallway with the case, asking, "Mrs. Gillespie, can you tell me what these are?" She has no idea, having never seen them before. So clearly it was Officer Gillespie's job to clean that bathroom.