Continuing on their hike, Roman is acting different after 18 hours, but they don't have access to a doctor for 50 more miles.
My brain is telling me to kill you!
Is that a bite on your arm?! OMG, did you get bit by the rare Atlantic Enhancer? Their saliva accelerates the progression of diseases. Your concussion must have caused CTE, and now, only 18 hours after this traumatic brain injury, you are in the second stage of CTE, having a lack of emotional control
Without a way to prevent it, Roman will continue suffering from CTE's defect Tao protein which is affecting the nerves in his frontal lobe, taking control of emotion regulation and memory. It is only a matter of time before his sense of self is completely lost.