It is in the form of an instruction to the committee chair to canvass the committee if this situation arises or happens. In my experience, it happens very rarely because mostly you will have a set of witnesses for the first hour from one organization and for the second hour it's going to be an entirely different organization appearing before you. You will start the round of questioning from scratch at the beginning of the second hour.
On June 9th, 2011. See this statement in context.