The reason the quick kill method works is that the shooter learns to sight above the barrel, rather than along the barrel. While focusing on the target, the muzzle is placed about below the target (the distance being measured at the muzzle), which places the barrel nearly parallel to the line of sight of the shooter. To hit the aerial targets, or other targets above eye level, the shooter focuses on the top edge of the target. When shooting at targets on the ground or below eye level, the shooter focuses on the bottom of the target. One of the points emphasized in quick kill is that it is essential to focus on a single spot on the target, such as the top edge of a thrown disc, or the bottom edge of a can on the ground.