It didn't happen again for a few months, when she had a vision of her teacher lying on the street covered in broken glass, and then she got hit by a car three days later. Her parents took her to a doctor, and then people started to do tests on her, and then her friends heard about it. That's when people got scared, and when they moved the first time. But it kept happening, she says.
Walter by this point is looking at a printout of her brainwaves or some science-y thing, like it matters, and he babbles on about the remarkably active Theta-1 waves in her occipital lobe, and how her brain is drawing elevated levels of oxygen and blood. Like every other case on this show, he and Belly had a pertaining theory: that some traumatic events "echo backward in time," sending ripples, not that we're consciously aware of them. Nobody laughs at this nonsense, and Walter suggests that her brain is uniquely sensitive to these vibrations that he and Belly made up. He asks if she's ever been able to control the ability, and she says that's not how it works. They're like dreams, she explains: vivid at first, but then they fade, which is why she draws them.
Emily gets sniffly as she says it doesn't matter, because whatever she sees, it always happens, and there's nothing she can do to stop it. Peter asks why she warns them if the victims can't do anything about it. Maybe because she's not an unfeeling lump of stubble? For god's sake, Peter! She says she thinks that if people knew they were going to die, then maybe they could say, "I love you" to someone, or just do one good thing. Well, you little dingbat, if that's the case, maybe you could EXPLAIN THAT to them instead of just silently handing them a gruesome drawing and running away? I mean, if someone handed me a picture of myself being impaled by a girder and then ran away, I sure wouldn't be thinking, "Welp, I guess this is how I'm going to die, and soon, so I'd better get my affairs in order."
Anyway, Peter and Astrid get to work on trying to identify the man, running the face through the MBTA database in the hopes that the transit user has a bus pass, and because a pencil sketch wouldn't result in either hundreds of hits or zero hits.
Meanwhile, Olivia thanks Emily for calling her, and says it must have been hard. She's got another reason for talking to Emily, though: finding out if Emily's sensing anything right now. Olivia looks at her, and she does start to hear a faint hum. She barely reacts -- Olivia is studying her face -- and doesn't get a chance to speak before her dad comes rushing in, but it's OK, because the FBI called him. "We didn't want your parents to worry when you didn't come home," Olivia explains. Not that Jim isn't worried; he asks Emily if they hurt her, and Olivia says he doesn't have to worry about them. Because nothing ever bad happens when Fringe agents are around. Emily tells her dad that even if they've never been able to prevent the deaths, they should at least let the FBI try.