This is called quickscoping. The timing is difficult at first, but you want to right click and then left click almost immediately. If you're aiming properly (which is hard without practice), it's a kill, the bullet will be accurate even though you're not scoped in.
The way they're doing this is to fire the first shot normally when scoped in, and then (without switching weapons) immediately aim and fire the next shot. That second shot will be accurate even though you're not zoomed in, but the aiming part is difficult, especially from longer ranges.
This tactic is useless in Counter-Strike: Source and Counter-Strike: Global Offensive. The AWP can be fired with the same precision whether it is scoped or not. In addition, the AWP cannot be fired until the primary attack button has been released and pressed again after the rifle has been cocked.
Avoid stooping to look around a corner. Crouch-walking makes it more likely that the enemy will see you peek first, as it reduces your mobility. Find and kill the enemy by using strafing, aiming, and scoping. Be as quick as you can, as peeking around a corner will expose you to different angles, and the enemy can kill you before you can take aim and shoot. Train to land flick shots or quick scopes so you can quickly take out your opponent.
Use the scope on the AWP at all times, as it is highly inaccurate at long ranges. Damage is not reduced, but quick-scoping is not recommended because the bullet may not always kill a target with total health instantly. Counter-attacks can be made more difficult if an AWP user is left open.
A quickswitch bind will switch to your knife, and then quickly back to your weapon when the binded key is pressed. This bind is commonly used by players who use AWPs, scouts and in some cases deagles to instantly switch to their knife and then back to their gun after firing a shot. This offers no advantage in terms of recoil or the time until another shot can be fired, but it means that the AWP and SSG-08 will not re-scope in after the shot has finished firing. It is also aesthetically pleasing, especially if you have a knife skin. 153554b96e