NO, por que??, las katar son 1 arma, esa skill solo sirve si usas 2 armas, diferentes sin importar la cominacion.
Edit: U.U que triste es la primera vez que RMS le gana a las descriciones de iro.
Damage on the left-hand weapon while equipping two weapons is (30+10*SkillLV)%. DOES NOT WORK FOR KATARS AS THESE COUNT AS 2-HANDED WEAPONS.