V goes to Lizzie's Bar to get information from Evelyn. Evelyn takes V to the basement and to Judy, who plugs them into BD (Braindance, a kind of VR environment of recorded memories that you can control). The BD has to be modeled "of your perceptions and emotional responces. Need to adjust that so the raw BD won't overwhelm you."
BD is "Good for analyzing details human perception, even boosted, doesn't grasp." In BD, you can either watch it from a first-person view, or enter an editor mode and analyze thermal, visual, and audio signs picked up by the recorder. BDs are explained as often used for porn, but in this particular BD, a "Thug" robbing a store is shot by an unknown person. V takes the perspective of the robber when they're not in "editor mode". Through analyzing audio and visual cues as well as the security camera's surveillance screen, V sees that the robber's associate is his killer.
After the BD, V says: "That was... too much. Felt... could feel the guy's... pain, his stress, his hope? Hope wrapped up in somethin' else..."