FC II Divine Defiance Feat?

[MacMathan]

I was reading over the Divine Defiance feat in FC II and I am not clear on how it actually works.

It states that you expend one of your turn attempts to get an immediate action to counter a spell if you have the same spell prepared or have dispel magic prepared.

Where I am not clear is do you actually end up casting the spell/dispel magic as a part of this action or is the prepared spell left in tact?

Any ideas?

 

[sukael]

I think you use the prepared spell, the idea being that you're getting a big benefit out of counterspelling without having ready an action first.