How can a gun fire immediately after swapping?

How can a gun fire immediately after swapping? - Crop man firing pistol in shooting range

I was playing against a guy the other day who would have his knife out, use the knife crosshairs to aim, and then switch to an awp and immediately fire. Whenever I switch weapons there is always a delay for the animation before I can fire. Was I seeing some kind of exploit?






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How can a gun fire immediately after swapping? - Soldier Toy Selective Focus Photography
How can a gun fire immediately after swapping? - Person Firing a Gun
How can a gun fire immediately after swapping? - Friends talking against burning fire at dusk in campsite





Firing Straight Down the Barrel of another GUN!!!!




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