He was one of the first to come to the Backwater, along with Beard, Capercaillie and other free stalkers. He went to the Zone hoping to cure his disease — hemoglobin dependence. This disease is a periodic thirst for blood: if you do not take blood for a long time, it can lead to death. On the Big Land, Tremor worked as a surgeon in a hospital — this allowed him to have access to fresh blood. Having succumbed to hemoglobin dependence, Tremor begins to kill stalkers, more often wounded.