After about six months, the staff noticed that Oscar, just like the doctors and nurses, would make his own rounds. Oscar would sniff and observe patients, then curl up to sleep with certain ones. What surprised the staff was that the patients with whom Oscar would sleep would generally die within two to four hours after Oscar's arrival. One of the first cases involved a patient who had a blood clot in her leg that was ice cold at the time. Oscar wrapped his body around her leg and stayed until the woman died. In another instance, the doctor had made a determination of impending death based on the patient's condition, while Oscar simply walked away, causing the doctor to believe that Oscar's streak (12 at the time) had ended. However, it would be later discovered that the doctor's prognosis was simply 10 hours too early – Oscar later visited the patient, who died two hours later.