Walter explains that the test subject in the film ("the archive footage," Walter helpfully explains, just in case Olivia and Astrid were wondering if he shot this this morning) is in a highly suggestible state, and we watch him do exactly what Walter indicates. Real-life Walter chuckles and then says he convinced the guy that he was in a meat locker. "And what is more impressive, I told him that this ice cube was a burning coal." We see Film Walter take an ice cube and run it along the guy's right arm. The guy screams in agony -- standard stuff for a hypnosis performance, but this guy's skin actually reddens and blisters. "Oh my god!" says Astrid. Keep it together, agent. Olivia asks what this has to do with frogs. "Toads, actually," says Walter, who explains that they're a species that secretes a psychoactive compound. There was a substance in Young's blood that he couldn't identify, and it turns out it's a concentration of the venom produced in the skin of the frog. "Properly altered, it's an hallucinogen, a very powerful one. Quite unlike anything I have taken," says Walter, practically smiling, thinking about dropping acid, I suppose. He continues: "It directly affects the amygdala, which is the fear centre of the brain.

Olivia's already piecing it together: "You're saying that Mark Young hallucinated being cut on his body, and then his mind made it actually happen." Walter calls it a clever means of murder and Olivia's all who in the what now? And Walter gets a little testy, saying, "Oh come on, we discussed this," and if anyone ought not to get upset with people not remembering things, it's Walter, and Astrid calms him down by reminding him that he discussed it with her before Olivia got there. Walter explains that the potency of the drug in Young's blood was at least thirty times the amount that any sane person would ingest: "Which suggests that someone else gave him the drugs," he says. I guess? So Walter's never heard of drug overdoses then. "So whoever those frogs belong to may be the killer," says Olivia, starting to look a little antsy. Astrid tells her she ran a property search on the basement where Olivia found the toads, but nothing came up. "How'd you even find it in the first place?" "It's a long story," says Olivia, an explanation that appears to be good enough for Astrid.