NS2 demo? What do you mean, like a video? Not sure how this would really matter as it's quite obviously abuse from what I said, though I do suppose if you can't take my word (wouldn't blame you) then that might be a good thing to have. (also I realize you are talking about evidence of him doing it, but I thought you might also mean whether or not he was in the wrong or not.)
Also don't worry, I'll be coming back (once I'm un-banned that is lol).