If the witnesses were in the room, talking over them would be seen as an extraordinarily disrespectful thing to do. It's fine to talk in a group if you'd like to avail yourself of any of the other spaces in this room. If the witness was in the room, you would not be talking over the witnesses like that. It's extraordinarily rude. I noted that you were doing it while I was asking my question, as well. It's extremely distracting.
We're here to work, and we're here to listen to these witnesses. If you're not interested in listening to the witnesses, then use another part of the room.