Warning: This post contains spoilers for episode 7 of The Last of Us and for the video game

Something The Last of Us—both the HBO show and the video game on which it is based—does well is humanize its characters, adding emotional depth in a world where they face punishing circumstances. We are offered backstories about the protagonist Joel, including that he lost his daughter early in the Cordyceps outbreak, to help us better understand his motivations. Now, viewers finally get to know more about Ellie and how she found out that she was immune to bites from the infected. Those who have played the video game will remember that a pivotal piece of downloadable content (DLC) called “Left Behi…