They would just take turns asking questions, and see if the other side could give a satisfactory answer.
Tan Mo shook her head and said, "This isn't an exchange... This is a placement test. Both sides take turn asking questions and answering questions as if it were a competition. How is this a discussion that will help us learn more? A discussion is where one side asks something that he doesn't know, then both sides discuss the question and propose their answers, and whether or not the answers are right, it may bring the question into a new direction. That is my understanding of an exchange and a discussion. A discussion is not like this, in which you attempt to ask obscure questions that the other side could not answer, and once they could not answer, you feel extremely proud that you are better... If the other side happens to answer your questions, you think that you've gotten slapped in the face...
