So what you're saying is that you don't believe the GP because you come to a particular conclusion as to the signal that such a reaction in the interview sends

So what you're saying is that you don't believe the GP because you come to a particular conclusion as to the signal that such a reaction in the interview sends about the character of the candidate? Are you asserting it's impossible (for reasonable person) to come to any different conclusion as to the signal that it sends? As compared with the author's suggested alternative, do you feel that asking such a question is a better way of determining both this signal and the something about the candidate's abilities you were hoping to discover?