The Last of Us finale on Sunday night sparked a broad discourse: How could Joel make this choice, between one girl and the fate of humanity? Spoiler: The gruff protagonist, who many viewers slowly but surely grew to love over season 1 of the video game adaptation, went on a killing spree, shooting a dozen rebels (Fireflies) and medical personnel on an enraged quest to save Ellie from a potentially lethal procedure. But another, more specific, debate also took off—this time, between medical residents online. “After watching the Last of Us finale did anyone else do the math that the doctor performing the surgery was probably a resident when cordyceps took over?