The fabulous Bishop boys have by now set up the pneumatic hammer and seismograph, while tremors rock the bridge and Broyles arrives with a team of FBI agents. Olivia tells them that "it's started" and that Peter and Walter are on the bridge. Walter turns on the program, and the pneumatic hammer starts pounding on the bridge, but something's wrong: there's a pop-up box saying WAVE CANCELLATION FAILURE on the computer screen. Amusingly, this software that didn't exist until like ten minutes ago has programmed error messages. Walter doesn't understand what's wrong, but Peter decides that there's something wrong with his "frequency-recognition program" but he can fix it. Yeah, there's probably a plug-in or something you can download for that, right?

Olivia arrives and asks how things are going. Peter says he needs everybody off the bridge. Walter agrees, not realizing that Peter means him as well. He protests, but Olivia and Broyles pull him off the bridge. There's a shot of a lone FBI agent who remains behind, and is there anyone who watched this episode who didn't think, "Well, that guy's dead"?

So there is frantic typing on both sides of the bridge, with Peter and Newton fiddling with their setups. On Newton's screen, the two bridges align, the connecting span shimmers into view. Meanwhile, Peter's having equipment problems. The network cable's been disconnected. He scrambles to plug it in, and then notices, on the shimmery alternate-universe bridge, a man walking away from him to the other side. The FBI agent draws his gun, but there's a loud piercing noise that sounds like when your computer used to have a dialup modem to connect to the internet. "You OK?" yells Peter to the agent, over the noise. But the agent doesn't answer, as he's too busy being disintegrated. Meanwhile, Peter just gets knocked on his ass. Broyles and Olivia and Walter can't do much other than watch from their (fortunately) safe vantage point. But good news, everyone! The screen now says "cancellation frequency locked" and the bridge disappears from view. However, the shadowy figure has already made it across to the other side. The shockwave from the bridge's dissolve sends Peter flying backwards into the grille of the SUV, knocking him out.