Anyway, Olivia's asking if there were any surveillance cameras, and there weren't, which Broyles suspects might be why the suspect chose the place, and I'd like to point out that if he's super-concerned about not being filmed, it was really smart of him to hang out AT THE WEDDING WHERE HE KILLED FIFTEEN PEOPLE, because how often do you see cameras at weddings?

There aren't any candles at the café, so Peter asks if there's another way the toxin could be delivered, and Walter says it would simply need a heat source to disperse it. Olivia spots the cup of tea, which Walter says would work if the water was hot enough. Olivia sniffs the cup: cinnamon. The forensics team gets to work on fingerprints.

Meanwhile, Walter is figuring out that all the victims have brown eyes: "That's the common genetic trait. Check the survivors, but I'm sure I'm right. It's a good thing you weren't here at the time, Agent Broyles, or you would be dead too." Hey, while you're checking the survivors, get them to look at the picture of the guy who caused the ruckus at the last place with all the dead bodies... no? Just going to head on back to the office? All right, then. It was just a suggestion.

So the Fringe team saddles up to ride out, because Walter has an idea why this guy is killing everyone. Walter wants to drive, but Peter takes the key and asks what Walter's idea is, and Walter says, "I don't know yet." Which is helpful.

As they leave, we see the Nazi's in the crowd gathered behind the police tape blocking off the crime scene. "Excuse me, officer. That man over there. He's named Bischoff." And the cop corrects him to Bishop, and asks the guy if he needs anything. "No, I'm just trying to place him. He looks just like his father," says the creepy guy, smiling. Hey, cop, do killers ever hang out in the crowd gawking at crime scenes? Is the fact that someone checking out a crime scene has more knowledge than normal about an investigator seem at all odd to you? No? Just checking.

Back at the Harvard lab, Olivia shows up to announce they could only pull a partial print off the teacup, so it's no good to run through any databases. Walter tells her she's just in time, and he claps his hands, and maybe he's just excited or maybe he's hooked his computer up to the Clapper, because it starts rotating the molecular model of the toxin, projected on a screen. As it revolves he shows which part is the deadly toxin and which part targets a particular group. "Because he can program the toxin to target whichever group he wants," says Olivia. Walter continues to say that the person who created it was quite proud of his work: "Although, I don't know why he should be. I mean, apart from the genetic targeting, the toxin itself is quite rudimentary. It's a blend of chromium trioxide, and hydrogen cyanide." Peter points out that chromium trioxide is highly regulated, so Olivia gets Astrid to dig up any companies that deal with it, and then asks Walter what he meant about the guy being proud of his work.