Solved Now how I damage zombies

[ELROMPEDIENTES]

command /test <text>:
    trigger:
        if arg 1 is "gun":
            give a stone sword named "&aGun" to the player
on rightclick:
    held item of the player is a stone sword named "&aGun":
        shoot an snowball in direction of the player

Plis not damage other players just mobs especiality zombies

 

[Deleted member 5254]

on damage:
    if damage cause is a projectile:
        if projectile is a snowball:
            if name of attacker's held item is "&aGun":
                if victim is a zombie:
                    stop
                else:
                    cancel the event

 

[Deleted member 5254]

on projectile hit:
    shooter is a player
    if name of shooter's held item is a stone sword named "&aGun":
        if projectile is a snowball:
            if victim is a zombie:
                stop
            else:
                set damage to 0

Thanks later i test And I give best answere