Aussie Oz has a good point. Please find out a bit about him first. Then, if he is simply a gullible soul, and you need to protect yourself, I would do as some others have suggested, and discreetly & ANONYMOUSLY get some information in his hands. Nothing in your own handwriting, only printed out from the computer, with nothing on it that could be traced back to you. Snail mail may be the safest way, with a printed address label, no return address. printouts from jwfacts sounds like a great idea. Also perhaps a mention of CoC in what you send?
Does anyone else find it hard to believe that with all the information so easily available on the net today, that anyone would actually study with the witnesses?!