Again, my point is not that the candidate doesn't pass, but that everyone's time is wasted. Just end the interview. I don't know why it should become a torture

Again, my point is not that the candidate doesn't pass, but that everyone's time is wasted. Just end the interview. I don't know why it should become a torture instead. Knowing why similar episodes happen in first place also helps. Some people are socially awkward. Some people are tired of and irritated by numerous phone screens without followups. Some people come from another culture. Some people are genuine assholes, though, no doubt about that. Still, I am surprised that such a tenured interviewer doesn't know that much about interviewees.