Hey Frank, why to use sarcasm, fair is a good guy, you know. He does a nice picture and you reward him like that.
And it's a little bit more complicated with screenshots than that, see. If you'd google around a little bit, you could find out that you can take pictures from free games without any licence shit, but it has to be you who has taken them. As such you are the author of it and even though it is from free game, free source whatever, you can claim some author rights upon it, especially when you draw stuff into it. The licence of the game is not inherited to the picture. You can see that also on things like NewGRF, gamescripts, etc., where authors can choose any licence they want, it's simply new product, thus new licence. You can believe, I know few things about licencing from dealing with it actually.
Fair's claim is justified here, though indeed, since it is quite simple picture, it is a bit laughable. I wonder though, why he'd do such a request.