Sanderson says that the conversation between Hawkwing and Tuon did occur, and that it was "interesting", and Tuon reacted "with great consternation" when talking with Hawkwing.
This is what Brandon said about that on the Twitter Q&A. I am hoping the encyclopedia has something more detailed on...
I dont have time at the moment, but in the twitter Q&A Brandon did mention something about their talk...mostly Touns feeling after and she wasnt "happy", but no real details. When I get time later I will find it and post his reply to that question here.