Why does John have to do it a certain way? I have my way of talking with a JW that may not match his, but I recognize he's a different person than me.
Let them go back to their congregation and talk down about him. Oh, he said "why don't you look up an abuse case in Philadelphia? And I just looked him in the eye until he walked away! After all, it's just lies isn't it?" And someone listening will be curious and look it up for themselves.
You never know.