It looks like Lisa might be useful as a fresh face for this game against Five. Based on Nine’s strange flashbacks, it looks like Five tried to escape the facility from their past with Nine and Twelve, but was left behind for some reason. Does she hold a grudge? Based on her behavior, it looks more likely that she’s just become so demented that she wants a challenge which can only be provided by Nine and Twelve.
How exactly is Nine planning on using Lisa in this game? It doesn’t look like she has a radio or transmitter of any kind, so how is she supposed to locate the bomb? Maybe she has some alternate goal that was discussed off-camera and will be revealed next week. Or maybe Nine has no intention of using Lisa at all and just let her go to make her feel better…that seems unlikely, though.