Paraphrasing and an empathic statement can help here to cut the tension. If it is abusive, you as the interviewer need to jump in and respond directly and assertively to the abusive one. Remind them of the purpose of your work today and the way everyone will conduct their work. If you are the interviewee, take a deep breath and paraphrase with some empathy also (this can help defuse and create some connection) and then provide your best answer without the fight and without an attitude. The audience will side with you. One method to diffuse the situation is to ask for the person’s name and then use it in your answer…this creates the human connection versus the hit-and-run experience. Work to understand their deeper question which is often built on fear or hurt.