I know I'm a three post wonder to you guys and what I say won't mean shit but I used to be fairly involved in the Simpsons online community and they had all sorts of problems like this with Fox. And just like this there were a fuckton of kids who decided to be tough and fight the big bad fox and ignore the C&D's. I expect this emo kid is being the same way. And, no, none of the "tough" kids were sued, Fox just went and threatened the host who would invariably put the site offline, which was almost as good as taking the domain. So, I think that emo boy should cough up the domains, he's obviously on the losing side but that as chrislingle said that threatening minors is probably not a great thing to do.
You are very right. A very good friend of mine made a game "Ghettopoly" anyway Parker Bros. or Hasbro, took him to court and fucked with him for years, threatening lawsuits and what not. In the end, once they figured out my buddy wasnt going to roll over and die they just whent to the host and simply said if you dont take his site down we are going to sue you, he is now out of business and doesnt sell many Ghettopoly games without the website.
So there you go Jon, simple solution! no need to get yourself into trouble just have your lawyer send a lettter to his host.