 This infected class was removed, but its ability to attract the horde was incorporated into the boomer's vomit.A persistent merit/demerit system was envisioned to provide positive feedback for good behavior, such as aiding a fallen teammate; and negative feedback for poor behavior, such as shooting a teammate.This would provide a score to rank a player's effectiveness as a teammate, but this system was removed late in the development of the game in favor of immediate, non-persistent feedback displayed in-game.