Life was a fickle pickle. One day it was all roses and sunshine, and the next day one's soul trickled across an endless void, looking for a flicker of hope, of light.
Jimmy died. He quite literally lost his life, lost his head, and got decapitated. Was that enough to wipe him off of the face of the planet? No.
This context was not metaphorical. He wasn't going to 'live forever' because the people would remember him as a hero, but he was going to live because sometimes, death was optional. It was optional when preventive measures were taken to avoid it.
In this case, what felt like an eternal slumber later, Jimmy opened his eyes, and saw his loved ones through the other side of a thick glass that separated him from them. He was in a container, within the same bunker that he discovered, and at this very moment, the liquid from container number two, the one he was floating in, was being drained.
