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Knowing how to effectively respond to an unexpected knife attack is a crucial officer-safety concern. If a suspect is further than 21 feet, you may be able to fire one or two shots, though you'll want to rotate off line to try to get out of the path of the incoming knife. To survive a deadly knife threat, know your tactics, study concealment, realize capabilities, learn knife fighting and develop basic knife defenses. Photos and captions by Al Abidin.