How does Light Breath+ Refined work?

With the introduction of the Weapon Refinery you can now Refine a lot of weapons to make them better and give them new abilities.

I have a Ninian level 40+1 who I love using, and noticed I can refine her Light Breath+.

The new ability seems rather amazing, and the second part seems a little confusing:

"After Combat, grants ATK/SPD/DEF/RES +5 to Ninian and allies within 2 spaces for 1 turn."

"If foe's range = 2, damage is calculated using the lower of the foe's DEF or RES"

The first part I understand, seems pretty good,
The second part I understand as "In combat with a foe 2 spaces away, if their DEF is lower than their RES, use their DEF in damage calculation instead" (as Ninian usually uses their RES stat in calculations)
This confuses me as Light Breath+ is a 1 range weapon, how can I attack enemies 2 spaces away?

I'd like to know if this is the correct meaning of the second part of the ability, and I need something like Distant Counter to make use of it?
Or is there something I am missing?