Razorback

The Razorback is an unlockable secondary weapon/item for the Sniper. It appears as an oval-shaped tribal shield with a car battery taped onto the back of it. The Razorback is worn on the Sniper's back and acts as a counter-attack to the Spy's troublesome backstab. When a Spy attempts to backstab a Sniper wearing the Razorback, their Knife will break the Razorback on impact, rendering it unusable. But the Sniper will not be affected by the backstab and the Spy will be unable to attack or switch weapons again for 2 seconds. He is still able to do the Fencing taunt but will not finish it before the freeze wears off as it is 5 seconds long and the freeze time is 2, meaning that it is generally better to wait the freeze out/hide. In addition the Razorback will make a loud noise that alerts the Sniper that a Spy is attempting to kill him, and stops scoping. Because of this, most Spies will not even attempt to backstab a Sniper with the Razorback and will instead use their Revolver to try and kill them. Once the razorback is broken, returning to a resupply closet will replace it with a new one. This is the only way to recharge a razorback. Sentry guns and teammates can make this situationally better as if the spy shoots you the teammates will likely kill the spy quickly and if they backstab you can quickly take advantage of his 2 second long vurnrability. Sentry guns will automatically target the spy both if he backstabs or shoots.