If he succeeded in escaping, he would let out a loud scream that alerted a horde, causing an attack - thus, foreshadowing the later Boomer bile concept, and additionally helping to establish early on in production that the Common Infected are driven to extreme aggression as a response to loud noises. The behavior for the Screamer was for him to wander around areas, much like the Witch, paying no attention to his surroundings until coming in contact with a Survivor whereupon, if sufficiently agitated, he would run away from Survivors in an attempt to hide. The Screamer was a cut infected from Left 4 Dead, he wore a psychiatric-style straitjacket. Left 4 Dead Game Trailer (Beta Characters)
