A routine hospital visit took a frightening turn when, in this fictional account, security-camera footage showed a nurse repeatedly trying to warn a patient just minutes before his condition suddenly deteriorated. The man had been sitting upright and talking normally, convinced that the strange pressure he was experiencing would disappear onits own.The nurse noticed something different. Hisbreathing had subtly changed, his responses were becoming slower, and readings on the nearby monitor were beginning to move outside their expected range. She urged him to remain in bed while she called for another member of the medical team, but the patient insisted that he felt wellenough to leave.