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|Description||Kill 4 enemies with 4 shots during a slow-mo breach in single player or Spec Ops.|
Knock-knock is a gameplay achievement/trophy in Call of Duty: Modern Warfare 2. It requires the player to kill four enemies with four shots during a slow-motion breach in campaign or Spec Ops. Some Spec Ops missions this challenge can be attempted on are Breach & Clear or Wetwork.