Sure, that's fair, but lordnacho has not specified exactly what he means when he says that the candidates failed. Did they just sit there blank, completely stun

Sure, that's fair, but lordnacho has not specified exactly what he means when he says that the candidates failed. Did they just sit there blank, completely stunned? Did they ask any questions at all? We also do not know his interviewing style. Some interviewers are very averse to clarifying the problem, which will backfire big time with a question like this.