Two days after the Survivors called for a rescue at the end of Blood Harvest. Louis and Francis are in a sterile cell, guarded by two soldiers. While Francis unsuccessfully tries to provoke the shorter female soldier into opening the cell to allow him to overpower them and escape, Louis is called over by the other soldier named Jeff, who asks if the "Whisky Delta" or "Walking Dead" have been mutating. Louis explains about the Special Infected to their surprise (namely the Boomer, the Hunter, the Tank, and a joke made by Francis about the vampire, which Louis shuts down) as they have been unaware of events outside Millhaven. Jeff proceeds to ask about a Smoker, which Louis starts to explain.
In another cell, Bill and Dash who are in the medical quarters for testing. Whilst Dash (her neck tatoo of "Sally" is properly shown in this view of her) is forcefully told to provide a saliva sample, which she continually refuses when Rivera, the soldier who is monitoring the scene, forces Dash to at gunpoint. Dash flips him off, but does so anyway.
The doctor then requests to examine one of the injuries Dash sustained. Dash again refuses until Rivera forcefully tries to get her to show the doctor her wound by holding up her arm.
Bill, enraged, then orders him to release her, in which Rivera states he isn't going to be the hero, causing Bill to state he isn't being the hero, but the "distraction".
Dash proceeds to disarm the soldier and hits him with his own M16.
Rivera's gas mask falls off in the incident, upon which he immediately panics and begs Dash to stay away from him due to his fear of being infected. Another soldier arrives on the scene, who the doctor asks to carry out his comrade. It is then revealed that the group have been diagnosed as Carriers. Which causes Dash to break down, and comforted by Bill.
The doctor explains that they transmitted it during their journey throughout Philadelphia, he states the Green Flu is unlike anything they've seen, despite trying to find a cure. He states that it is sometimes airborne, but other times not, thus stating where the "airborne" theory originated from. He then assumes that Bill and Dash are father and daughter, saying the Carrier gene runs on the father's side. However, Dash denies that Bill is her father tearfully as a flashback ensues of her father's attempted rape. And later of Sally shooting him in the forest, in a serprising "dark" moment for Sally, being very mercyless. Revealing Sally was holding up bottled up hatred of the man, for having not been able to stop him despite knowing what he was doing.
Back at the outpost, Dash is in Bill's arms, having relived the horrific moment, and also realizing that they mayof caused the earlier helicopter pilot to be infected which caused her to shoot him.
The doctor then tells them that they are not dead because of him, and that he is not dead because they believe he can find a cure. The doctor then mournfully states that when they find out he cannot, he and all the Carriers will be killed, and so asks that they all help each other escape. A klaxon then wails out, and the two Survivors angrily tell him the alarm may have attracted every single Infected in a hundred mile radius. Dash says they have to move quickly and find some guns too. Meanwhile, in Major Everly's office, Lt. Mora and two other Soldiers (presumably from the Lieutenant's Platoon) storm in, saying he is now relieved of command and that they are evacuating everyone.