I dont think tha was true. They are just such cool easy going people that it was just polite of them to let the others speak. But I didn't se them get interupted or anything when they were talking.
side note... I had to work REALLY hard not to gush and geek out, But a mere hour or two before I had to leave for the airport I got to sit down with Jim in the lounge and chat for a few in the bar. (30-45 min)
Then share the shuttle ride to the airport with Shannon and Jim.
They really are some of the kindest people I have met.
You were there too? Huh, we met and didn't realize it.
Thanks, Enj. Yeah, let's leave unkind remarks about other authors off this board. Heck, it's possible that the author isn't used to speaking in front of crowds, and didn't mean to be rude. Panels can be really exciting, both for fans and authors. Maybe she just got a bit over-excited. 
I can keep my mouth shut every once and a while. It's possible. I swear!
addition to the fan base though... I do agree that thre were a few times taht the conversations and comments were going and one would jsut barley have stopped speaking when antoher would jump right in and all but cut the other person off. But I think I remember it happening to more of them then just Shannon.
But the vidoe will prove me wrong if I am.
Don't have video for that one, but it was the same author who did it more than once. But you're right, it wasn't just Shannon she cut off, she also did it with Sam Skyes.
