On the roof, Veronica looks for Mac, until Beaver calls her name. She freezes, and turns to find him pointing the gun at her. Beaver implies that Mac's dead, strides forward, and yells at Veronica to throw him her bag. I should tell you that the episode goes totally off the rails for me from this point on, so if my opinion is going to detract from your enjoyment of the episode (not that it should) I'd suggest skipping ahead at least until we're off the roof. Fair warning and all, so really, don't email me. Beaver retrieves Veronica's stun-gun, and notes that saying he's a killer is a serious accusation, and asks what she knows. The ensuing scene is completely ridiculous for more than one reason, but the biggest to me is very simple: There's no reason for them to be having this conversation, other than for the audience's benefit. This, I think, is what a lot of posters meant when they rather astutely said that the scene came off like a Scooby-Doo-esque reveal. There's little enough reason for Beaver to want to know what Veronica knows -- he's going to kill her anyway, so he should stop wasting precious time and put a bullet in her head. But there's absolutely no reason for Veronica to be truthful here -- what does she think is going to happen to her once she lays everything out? I mean, she jumps to the conclusion that Beaver's a mass murderer from the picture, and yet she really thinks that once she triumphantly tells Beaver how she's figured out his evil plan, he's going to lay down his gun and submit to a citizen's arrest? Not at all credible, to me.
Veronica tells Beaver she knows about The Woodman's abuse, and we flash back to a French lab (explaining the French in the background on the tape) wherein Peter and Marcos are expressing their desire to expose The Woodman.