If an entity is within the radius, the script triggers the RemoteEvent used by the game for attacking, effectively telling the server you hit the enemy, even if you did not. Risks of Using Kill Aura Scripts

Prevents you from accidentally attacking allies.

This is the cruelest trick. The script makes a glowing circle (an aura) appear around your character and shows fake damage numbers floating off enemies. In reality, you are doing zero damage. It is a cosmetic placebo.