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The Knife Glitch is very simple.
First get some knives then go to the place where there is a sniper rifle. Now kill the enemy with a head shot using the knives there then get the sniper before he falls down to the floor. The Knife should be levitating in air. You can also do this when you are in the sewer area when the door closes throw a knife at it and when the door opens it will be in mid air.