I'll just say that, as I already ruled, the motion is in order. Chapter 20 of O'Brien and Bosc says:
The Standing Orders state that standing committees have the power to order the production of papers and records, another privilege rooted in the Constitution that is delegated by the House. In carrying out their responsibility to conduct studies and inquiries, standing committees often have to rely on a wide array of papers to aid them in their work.
Essentially what we're saying is that they want additional briefs and to hear additional witnesses, so this motion is in order.
As to the tactics being used, I'm not going to start censoring freedom of speech around here--although my mother used to have a saying that almost applies in this situation: “You kids are driving me crazy.”