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"
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.