Hello and Good Day,
I just want to suggest to put a large SD potion in NPC, the advantage of SD potion is that when it use, the character cannot be killed fast because based on my experienced before as an old MU player, SD life is the first to get reduce before the red HP, unless you have the weapon that SD ignore on it. Trust me, i have tried already this experiment before. Also when using SD potion you will not flinch always and you can combo more. I am an SD user yellow option, so if there is no SD potion, SD ratio increase in yellow option is useless.
Hope this one will be granted.