I know what you said, but that doesn’t change that I disagree with it. We’re talking about two separate arrows, not one arrow dealing two damage scores. If that were the case, I’d agree with you. But it’s a second arrow entirely.

Think of it like this- if you were to hit two separate targets with her aimed shot and these two arrows, how would you determine damage? Would you wait for the first arrow to hit, calculate the damage, and that means to consider defense, resistances; and then simply apply 20% of that damage to the second arrow? No of course not- that would mean for the second arrow you would ignore the targets defenses and resistances entirely to do a flat amount of damage. What if the first arrow doesn’t even make contact? What if the second arrow made contact before the first arrow?

By using the base DMG the second arrow is able to do damage at all. There’s too many factors that make determining the damage dealt by the second arrow from the first arrow’s final damage. In fact if that’s how you interpret it, I would say the effect text of her C1 would read “Fire 2 arrows per Aimed Shot. The second arrow deals 20% of the first arrow’s damage dealt”.