The Yith

Wang Ruoxiang rushed down the corridor towards the patient's ward. After briefing the command central, Elder Tong ordered her to initiate contact. Was this a new symptom of the patients' Locust Sickness? However, of the 900 plus patients, only 150 people showed this symptom. It appeared like hallucination but the patients were kept in isolated rooms. They did not have contact with anyone, not even the medical workers, after being quarantined. So if this was a ruse, how did they manage to come up with the same statement, claiming that they had turned into a kind of creature that travelled from the future without any interaction?