In Psycho Shifters, Sadie’s trauma is portrayed as the catalyst for her fracturing of herself and the creation of a dissociative state, which she calls “the numb,” which becomes a necessary and powerful tool for her survival. When she first arrives at the fortress, she discovers that the numb makes her a hyper-effective warrior, but its use comes at high physical and emotional cost. Mas presents this trauma response as a double-edged sword, emphasizing that although this repression allows for her short-term survival, it drains her physically and emotionally and leaves her feeling isolated from others. 

The novel establishes “the numb” as a direct psychological adaptation to relentless childhood abuse, a mental switch she developed that allows her to endure otherwise unbearable trauma by suppressing all emotion and pain. Living as a servant under the cruel beta Dick, Sadie learns to mentally detach during his frequent beatings. As a 10-year-old, she pretends she is a “great alpha warrior” who turns the violence back on her abuser (9), and as she gets older and the abuse intensifies, this imaginative escape evolves into a deeper state that she can switch on and off. She reflects that “the numb had suddenly appeared” when she turned 12, arriving just in time to help her survive Dick’s “increasingly violent abuse” (15). This origin story frames this fractured state as a logical coping mechanism forged in an environment of constant threat.

When Sadie is 20, this survival tool is quickly reframed from a defense into a weaponized state. She decides she must kill Dick to protect herself and her sister, and for the first time, she consciously activates “the numb” to transform from a terrified survivor into a cold, tactical killer. Her thoughts become clear and emotionless directives: “Sweep out his legs. Take the belt. Wrap it around his throat and kill him” (15). This same state proves invaluable when she is thrust into the alphas’ brutal training regimen at the fortress. After she is shoved to the ground, the numb clicks on, and she is able to endure a punishing series of fights without flinching, earning the grudging respect of the other soldiers. In these moments, her trauma response becomes her greatest asset, allowing her to function with a level of pain tolerance and focus that is otherwise impossible.

The narrative, however, consistently emphasizes the deep cost of this survival tool. Once the numb deactivates, the suppressed pain and emotion return with debilitating force. After her first training session, Sadie only remains standing because she is numb; the moment it wears off, she collapses, overwhelmed with the return of “every repressed emotion [that] battered through [her] head” (48), followed by intense nausea and physical agony. In addition, as she relies on the numb to get her through increasingly difficult circumstances, her distance and cold behavior result in isolation that she must consciously overcome to make friends and find support. By showing the intense suffering and isolation that results from using the numb, the novel argues that while such a coping mechanism may ensure survival in the short-term, in the long-term it is an evasion that causes further suffering.