Grace of Blades - When TWF isn't TWF

[shatterjack]

From the Dervish Defender archetype's Grace of Blades ability:

At 15th level the dervish defender gains mastery over her two-weapon style. Whenever the dervish defender makes an attack with one weapon while holding two or more weapons or using a double weapon (such as during a full attack during which she is not two-weapon fighting, or using a strike that includes a melee attack) she increases that attack’s damage by an amount equal to one of her off-hand weapons’ damage (including any extraordinary and magical enhancements) plus one-half her Strength modifier.

This presents an interesting problem for me as I am trying to figure out how to code this in HL. How can I detect that the hero is wielding two weapons, but only attacking with one? Is that even possible?

 

[Aaron]

There is no information on what weapons you're attacking with, only which weapons you're equipping. Therefore, I would give this ability an activation, so the user can turn it on and off as needed.

 

[ShadowChemosh]

Yep pretty much what I was going to say.