As she treks through the environment, her calm begins to dissipate. Ellie leaves Joel and begins investigating her surroundings for medical supplies. Joel's timeline focuses on scavenging and combat. In the present, staring at a dying Joel, she vows to save him: the last living friend she has. Though it's never explicitly stated, the leap to her time with Riley seems almost as though players are scrubbing through her recollection of that day long ago, the day that ended with Ellie losing her best friend. Left Behind jumps between these two times in Ellie's life, beginning with Joel before transitioning to Riley, hopping back and forth between climactic moments. "I thought you were dead," Ellie tells Riley, foreshadowing what we already know. In an exposition-laden recounting of their last meeting, Ellie questions where Riley has been for the last few weeks.
In the past, Ellie is surprised to be stirred out of her slumber one night by her friend. Dragging him into an abandoned store, Ellie patches him up as best she can but quickly realizes his wounds are far more serious than she anticipated. No such luck.Left Behind begins in the present with a familiar scene from The Last of Us, Joel injured after an encounter with other human survivors. Despite the knowledge of Riley's fate – we learned of her death in The Last of Us – I still found myself becoming hopeful for her future, wishing something magical would happen, that I could avert the tragedy. It attempts to tell an impactful story with an ending every player is assuredly already aware of, reaching into the past to tell the story of Ellie and her best friend Riley.
"Left Behind," the first and only piece of narrative downloadable content for The Last of Us, has a strange task ahead of itself.