You seem to be getting a bit snippety CapnZapp....I did what you asked - sorry if it was less than efficient...in any case, I'll go back now and examine the rest of your post and see what I think.Sorry but I don't understand. Who is character C? Or perhaps you're merely proposing I add "unlucky character C" who uses the feat when she shouldn't?
I'm sorry - while this might illustrate when and why exactly you shouldn't use the feat, I don't want to bog down the analysis with flawed gameplay, since that has no bearing on its real utility.