void main()
{
if(GetLocalInt(OBJECT_SELF, "fired") == 0){
    SetLocalInt(OBJECT_SELF, "fired", 1);
    ActionCastSpellAtObject(SPELL_FIREBALL, GetObjectByTag("target"), METAMAGIC_ANY, TRUE);
}else{
    SetLocalInt(OBJECT_SELF, "fired", 0);
}
}