Louis knows of the penny dreadfuls and ridiculous monsters in film. Not to his taste. Zombies, however, had not yet gripped the public consciousness as vampires did. A zombi was simply a thrall. Even vampires are, currently, delightfully passé, niche, with no place in the modern world of bright electric lights.

Louis knows well the dependence on a substance. He did it when he was human. To an extent, he does it when he's a vampire too. There's nothing quite as nourishing as people. So he is understandably concerned, though not exactly for Kieren, and he affects casualness:

"What happens when you run out of medicine? At least blood replenishes itself, given time. Even if I wanted to eat everyone in town, which I most assuredly do not, that would just leave me to starve. What is Capri-Sun, some kinda fruit?"