The mobile lab—nicknamed “Rosie”—is a combination high-tech research facility, armored tank, and motor home. Caldwell takes inventory of the lab equipment while Parks and Gallagher remove the driver’s body. Parks then rifles through Rosie’s operation manuals and is trying to restore power when Melanie approaches. She wants to talk to the sergeant privately. Justineau is uneasy leaving Melanie alone with Parks, but she obliges. She finds Gallagher taking inventory of supplies. He finds a CD player with a diverse music collection but, unfortunately, no food.

Parks convenes a meeting, but Melanie is not present. Parks informs Justineau that she has left but promised to return. Justineau is troubled that Melanie didn’t tell her about it. Parks proposes restoring the power and driving Rosie the rest of the way to Beacon. Since they don’t know how long it will take to fix the generator, however, they need to find food immediately. Gallagher and Justineau are assigned to scavenging duty, but before she goes, she asks Parks about Melanie. He reluctantly tells her that Melanie had to get away from the group because the e-blocker wasn’t covering their scent anymore, and she didn’t want to attack anyone.