Walter, looking pensive, walks out onto the porch, where Astrid is chillin' with Teddy. Walter sees Broyles alive, and goes scurrying across across the front lawn to talk to him: "You can't make this public, Agent Broyles. We need to let them keep their secret," he says, but Broyles points out that three state troopers were killed (and, motives aside, a sheriff and his deputy, plus that federal agent from a few years ago). Walter counters by telling Broyles that those responsible were brought to justice. "But the rest of these people, you have no idea what will happen to them."
Broyles tries to get a word in edgewise, but Walter worriedly talks about how these people will be studied, examined, tested, humiliated. Finally able to speak, Broyles thinks about it, and then asks Bishop if he found the machine that transforms them. Walter doesn't get it (since Broyles obviously knows they found it) and says these people have been harmed enough, etc. "I don't think you're understanding me. If you didn't find the machine, there's nothing to report," says Broyles. Walter, who every second episode or so moves me almost to tears, says thank-you.
Teddy stands at the town sign, watching as the Fringe team drives out of town. Walter looks back through the rear window at him. Shouldn't he see lumpy Teddy instead of non-lumpy Teddy? Anyway, he says it's remarkable that Rose was willing to expose her secret to right a wrong: "How very brave of her." Peter says Walter was very brave too: "The way you spoke up for those people... you didn't have to do that, Walter. I'm proud of you."
Walter, quietly, says, "I'm glad you choose to see me the way you do. Very glad indeed." You know, because of how Peter doesn't know yet that he's actually a clone or a Cylon yet or whatever? Peter smiles, instead of saying, "Wait, what?"
Finally: wondering what "Johari window" is but too lazy to Google? Here.