Derek is tasked with performing a risky surgical procedure in order to remove a spinal tumor from a patient. He and Meredith discuss the problem and potential solutions. During the discussion, Derek draws a diagram of the spine that illustrates the issue the patient is facing. Derek faces a dilemma: if he cuts the cord, he will kill the tumor, but the patient will lose function in both of his legs. Derek tries to find a way to cure the tumor without cutting the cord.
The team pulls up a hologram of the perpetrator, Renard, and discuss how a bullet got lodged into his head. They mention that the bullet is slowly moving through his medulla oblongata and killing off his senses: touch, smell, and pain. They state that he is getting stronger every day until the day he dies because he lost these senses.