One shot one kill
The most efficient form of murder with a firearm. One shot one kill means every shot you take is a headshot. Precision shooting. If you spray, you miss and then you die.
Surrounded by an angry mob, AC decided to save ammo by using one shot one kill tactics.
One shot, one kill
Overwatch's Widowmaker's lie about just needing one bullet to kill an enemy in the opposing team.
Widowmaker voiceline: "One shot, one kill"