Why does brick whisper to himself

In the season 1 finale of 'The Walking Dead', there's a significant scene between Rick and Jenner. Jenner whispers to Rick that everyone is infected with the virus, and no matter how they die, they will turn into walkers. It was a heavy, pivotal disclosure for the storyline of the show.

Growing up with enchanting tales has been for me a concern over the Red Brick Road. Its famous cousin, the yellow brick road in 'The Wizard of Oz', always takes top billing. The yellow Road, as we know, brought Dorothy back to Kansas. Glimpses of it appear here and there, but no one can say for certain where the Red Brick Road leads in Baum's original books. Fans and writers have had plenty to ponder over. They each come up with their own theories. All these different possibilities have one thing in common: they express an idea or touch on some aspect of its meaning. As some people put it, it runs off into the Quadling Country-an area of Oz. In 'Dorothy Must Die', it led to a place of dark magic. Fascinating, right? In our lifetimes, we tend to meet with red and yellow brick roads. One definitely leads to somewhere. But on the other hand, at least in English-speaking countries outside these stories it is without any clear connotations whatsoever. This is an empty space: a great room for us to elaborate and shape the paths uniquely our own.