NZGamer writes: "I feel kind of sorry for those Infected who are just wandering around minding their own business. Not all of your enemies in Left 4 Dead 2 come right for you; some chill under stairs, in bathrooms, or behind trees. Some are even leaning against fences with their heads against their arms as though counting for a game of hide and seek. But where would the fun be if you were to show mercy? Like Ellis says in the blood-curdling opening cutscene - "Kill all sons of b*tches."