anyone know how to fix this skript?

[pleumz]

on death:
if attacker is a player:
if attacker's health is 3 or below:
set attacker's health to 20

so what im trying to do is when i kill someone and i have 3 health or lower it will set attacker health to 20 or maybe if you can help me change it to regeneration 3 for 3 second would be nice

 

[kamilleon]

on death:
    if attacker is a player:
        if attacker's health is 3 or below:
            apply regeneration 3 to attacker for 3 seconds