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Infected agro
Sight, sound, then they remember
Short answer
They hear the shot, the door, and your pride. A wall of them means a player was here. Walk around.
Also: agro · aggro
How it works
Infected see and hear. A gun writes a pin. They keep a short memory of where you were. Exact ranges stay empty.
What to do
Melee first when you can. Pull them out of doorways with a throw, not a magazine.
Don't
Don't farm agro for a clip next to the duo's extract.