Placing a gun back in a shoulder holster with your finger on the trigger will cause you to walk with a limp. Flash hiders don't really. If you have cleared all the rooms and met no resistance, you and your entry team have probably kicked in the door of the wrong house. If a cop swings a baton in a fight, he will hit other cops more often than he will hit the bad guys he swings at. If you have just punched out a handcuffed prisoner for spitting at you, you are about to become a star on Eyewitness News.
Bullets work on veteran cops too.
They also work on weight lifters, martial arts experts, department marksmen, Vice cops, S.W.A.T. jocks, and others who consider themselves immortal. When a civilian sees a blue light approaching at a high rate of speed, he will always pull into the lane the cop needs to use. If you drive your patrol car to the geometric center of the Gobi Desert, within five minutes a dumb-ass civilian will pull along side you and ask for directions. You can never drive slow enough to please the citizens who don't need a cop, and you can never drive fast enough to please the ones who do. Any suspect with a rifle is a better shot than any cop with a pistol.