Assef may come from a wealthy family and, in the past, may have been a meticulous dresser, but his decision to join the Taliban meant that a few of his habits had to change. He is proud of the Russian jailer that he killed, and brags about the many Hazaras he murdered in Mazar-i-Sharif. He is probably equally proud of the stoning death in which he earlier participated, and he wears the blood as a badge. He may also have deliberately failed to change his clothes in order to further shock Amir. As for the track marks Amir saw on his arms, they were probably from injecting heroin or another drug.