The novel starts to associate Lucy Gray with the mockingjays through this song she writes about Arlo’s hanging—she, like the mockingjays, turns a horrific event into something beautiful. It’s clear that Lucy Gray has been traumatized by her experience in the Hunger Games. But Coriolanus is, she believes, the person who got her through it, so they’re able to connect over the trauma they both experienced. Admitting that they both killed also levels the playing field—they’re both capable of murder, despite their other differences.