His voice grew less confrontational as they went along
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I just watched it on tape, and agree with you. Gregory became respectful in his later questions, as if seeking real answers. He is probably auditioning for the full-time gig, and decided to play it straight.
I think you're right as I look back on it. Wouldn't it be funny if he found out it felt good to play it straight and kept on doing it. What if it spread.