Fighter Defensive Weapon Training

[Ectar]

D20PFSRD wrote:

Defensive Weapon Training (Ex) The fighter gains a +1 shield bonus to his Armor Class. The fighter adds half his weapon's enhancement bonus (if any) to this shield bonus. When his weapon training bonus for weapons from the associated fighter weapon group reaches +4, this shield bonus increases to +2. This shield bonus is lost if the fighter is immobilized or helpless.

How does this work should the fighter be dual-wielding (crazy concept, I know, but work with me).

Scenarios:
1.)Fighter has two +1 kukris.
2.)Fighter has a +2 kukri and a masterwork kukri.
3.)Fighter has two +2 kukris.

The way I'd think this should play out would be as follows:
1.)Fighter gets +1 shield bonus to AC. The two +1s mean nothing.
2.)Fighter gets +2 shield bonus to AC.
3.)Fighter gets +2 shield bonus to AC. The second kukri means nothing.

Does anyone think it would be different? That the enhancement bonuses would add to the fighter's benefit?
As a GM I might allow them to add that way, but that's mostly because TWF fighters are a considered pretty sub-optimal to begin with.

[bigrig107]

Well, first of all, it's half the enhancement bonus to his shield bonus.

And they wouldn't stack, as they are both enhancement bonuses; you choose the highest instead.
It's like holding a masterwork longsword in one hand and a +5 dagger in the other, and trying to put the +5 on the longsword attacks.

[Ectar]

Agreed, the ability already grants a +1 shield bonus. In the first case the weapons don't do anything to that effect.

And again, I don't think they'll add together.
But I am looking for verification ^_^

[Imbicatus]

Bonuses of the same type don't stack. You would have two +1 shield bonuses, so you only take one. Each weapon provides an enhancement bonus to the shield bonus, so you use the weapon with the higher bonus to calculate the shield AC.