Other

Pre-aim Peek

You're behind a corner with a way round on each side, and an enemy is holding on one of them. Jiggle left and right to find it, get back in cover and put your crosshair where its head will be, then peek that side, stop and tap. Only headshots count, and shots on the move go wide, so counter-strafe before you shoot. The next enemy shows up once you're back behind the wall.