What I love the most, I think, is how Andrew discusses it. He manages to present his case thoroughly and brilliantly and Biblically...but also kindly and non-judgmentally. You can be firm and clear without compromising on the truth. And for me watching it...Bell is on the ropes during this entire interview. He simply does not have actual arguments to bring to the table that can hold up to Andrew.
My favorite point, and Andrew makes it brilliantly, is where he points out that the texts on sexual morality have been consistently interpreted as anti-homosexual by every Christian theologian in every culture for 2,000 years. He then says, "The humility of orthodoxy is to say, 'I'll stay with the Church unless I'm sure that the Church has always been wrong about this. And in that sense, I want to understand what arguments you're bringing to the table to suggest the Church had always been wrong about it."
Make sure and watch the whole thing, it's very well argued.