The matching bite scars on Casey’s and Blake’s forearms symbolize their shared trauma and their unique resilience in continuing to face it. As two of the few known individuals to have survived a biter’s attack without turning, the scars physically mark them as equals, setting them apart from other survivors and binding them together. Initially, the scars are a testament to their parallel journeys of survival in fighting the physical threats of the biters, a permanent record of having faced the infection and overcome it. This shared status creates a foundation for their relationship after enduring the same crucible.

As their relationship develops, the scars come to represent the past traumas—both from the bite and from their earlier lives—that they must confront to achieve true intimacy. For Blake, overcoming the infection parallels his need to atone for his past cruelty, which he attributes to his abusive father’s influence. He confesses that his father was his “monster,” adding, “and then, like these goddamn biters, he turned me into one too” (209). This comparison directly links the monstrousness of the biters to the human-made monstrosity of his past. By surviving the bite, Blake is symbolically offered a chance to survive his own history and become a better man. At the same time, Casey grapples with Blake’s past bullying and the loss of her childhood due to her father’s obsession with doomsday prepping. Both characters are forced to overcome their trauma to truly build their new relationship. The scars are thus a constant reminder that for both him and Casey, healing from past wounds—both physical and emotional—is the necessary prerequisite for building a new, trusting relationship.