Assalmau alaikum,
So is this a question, news, or a post to start a conversation? Before I begin with my response, I would like to tell you that it is forbidden to visit anti-Islamic material unless you have a strong faith and is willing to refute their materials. Anyways, this happened a very long time ago. I do not think that Zakir Naik should debate him since Zakir Naik isn't that much of a good apologist with all honesty. He has many liberal views and he makes some mistakes when it comes to Islam (like him saying that visiting a Hindu's funeral is permissible or his constant spreading of
the scientific miracles HOAX and sin). I believe that he is a very good داعي (can't spell it in English, someone who does Dawah) and he knows how to clear some misconceptions and spread Islam. But like I said Before, he isn't a very good apologist. Second, David Wood has absolutely no right to accuse Zakir Naik of running away. Muslim Apologist Aqil Onque has challenged David Wood many times however he ran away. He even challenged him on the Trinity Channel and he had a very nervous look on his face and refused (it is on Yahya Snow's channel look it up) .