I would phone them or make a disposable email and warn them, that way if they take the news bad they'll have a hard time hunting you down. I can't imagine why

I would phone them or make a disposable email and warn them, that way if they take the news bad they'll have a hard time hunting you down. I can't imagine why they would react badly to that in light of all the recent security issues in the media, but there's all kinds of jerks in this world.