I agree with you. I don't know if there are any further comments, but I have found in my experience that if the questioner felt the witness was not answering the question they would say “point of order”. They would appeal to the chair and say, “On a point of order, I don't think the witness is answering the question and I would like to explore this further.” If you have a chair who's sensitive to the situation and fair, I think it can be handled that way.
On May 3rd, 2006. See this statement in context.