Google L5 “Leadership” Followup Interview

Had an onsite loop for L5 at Google. HC wants more leadership signal for L5 with additional behavioral interview over phone. I think this is because interviewer just asked a bunch of technical distributed sytems questions in what was supposed to be behavioral round - nothing actually behavioral. HC approved L4 without additional interview, but not considering < L5 so going to do it. Anyone gone through one of these followups for L5?