In the lab, Simon opens the box, which looks kinda like a handheld futuristic curling iron, but when he flicks it on it blows back everything on the table, quite forcefully. "Crowd control, back before the Loyalists decided it was easier just to use bullets," he tells Etta.
He affixes little discs to Walter's block of amber, saying he's quite proud of "these little beauties." Etta's holding the stun gun and he's got the control panel for his amber-negating discs or whatever. "When I say," he tells her and she says, "Really? I was gonna go before." Oooh, saucy! Yeah, this is definitely Olivia's kid.
After he gives her a sufficiently long stinkeye, he flips on the control panel and counts down from three. She fires the stun gun, which sends Walter flying backward, slamming into the wall, as the amber evaporates and then re-solidifies. "I didn't say 'now'!" yells Simon and Etta accuses him of being late.
They give a groggy Walter some sort of injection on his arm and revive him; Simon introduces himself, saying it's a great honor to meet him. Walter opens his eyes and tells Etta that she's very pretty. She smiles and tells him they just removed him from the amber. When he hears he was inside twenty years, Walter says it's no wonder he's so hungry and asks if they have anything to eat. His tapeworm's sweet tooth isn't going to feed itself!
Fortunately, the exceedingly considerate Fringe agents have a bag of licorice for Walter, who practically has an orgasm when he starts munching on one. Olivia... I mean "Etta," isn't interested in wasting any time and tells Walter that their records indicate that, after the invasion, Walter and his team discovered a way of getting rid of the Observers.