Rick, Glenn as well as the remainder of his little group return to camp to discover walkers have assaulted it and determine they must uncover head and security for the CDC. Dr. Jenner clarifies that scientists attempted to comprehend the zombie virus and how to treat it, but that there’s no known treatment.
Dr. Jenner determines to remain and perish in the building’s destruction, considering there’s no hope for mankind with no treatment to the zombie virus. Rick begs with Jenner to open the doors considering all hope isn’t lost and before Rick leaves Jenner whispers something (that can’t be heard by the crowd) and Rick is clearly shocked and horrified by whatever he’s told. A grenade is used by someone and everybody is able avoid a group of walkers, and to evade and get to their vehicles and live to fight another day stopping the season.