I didn't think it was possible but Becky has added another tick to her repertoire! She asks a question, then while the other person responds (in this case Oren Liebermann), she keeps on uttering (saying? mumbling?) "Mmmm. Mmmm. Mmmm. Mmmm". Must be very off-putting for the interviewee. I've noticed this when she interviews from the studio and interviews via link but person to person, it must be irritating.