Daniel replies:

I had planned to write a third book, ""I Snarked with a Zombie,"" in which your questions might have been answered.  Alas, the publisher let me down, pointing out that while the first two books made a profit, it was not an obscene profit, which is the American way.  Thus I had no incentive to write the Zombie book, unwealthy and relatively unknown as I am, and was obliged to turn my attention to books about cute bunnies and the like.  I suppose I could discuss your concerns with you now, but it might depress me.  Thank you for your interest in my work.