There is one in the party right now, and just got the first level of the prestige. Also, she is a gnome, which just makes me happy (we really don't care so much for min/maxing) but is besides the point. Any way, what is the point is a question in regards to the breath attack.
She asked if she would be able to continue using her song ability if she shot one out, or if the attack would interrupt it, and she would have to activate another usage afterward. As of right now I am leaning towards saying yeah, she can continue singing. Its not effecting the game, and I really cannot see how it could possibly make things go awry, I'm just curious as to what other people think. Right now we just say she is yelling at the enemy.
Also, a little aside: barbarian to duelist is one of the coolest non-hardcore maths combos I have ever had the opportunity to dm for. This is one of my favourite groups ever.