That's kind of the point. They won't let him answer properly. They'll interrupt him, talk over him, all talk at once and drown him out.
“They’ll interrupt him, talk over him, all talk at once and drown him out.”
I said this elsewhere, but he should wait for a pause, then say he’ll not engage in a shouting match, and if interrupted stop talking immediately and let the silence speak for him. He should not threaten to leave the interview.
Also, he should make his responses short.