The beauty behind killing someone who no one thinks you're willing to kill is, of course, that you throw people out of their comfort zone. And that's good because you want people to be on the edge of their seats.

Ultimately people don't watch shows because of how realistic they are. They watch them because of the same dramatic elements that have always made stories interesting. And fundamentally if those elements don't work, no amount of reality is going to be enough to keep people watching a show.

The rule, I think, is: Do your homework, learn what there is to learn about the real world, and then when you get in the room, forget it all.

The idea that you could stitch together every detail episode to episode and preserve continuity for the length of a season and tell a story while using no time cuts, no flashbacks, nothing but pure real time just seemed too difficult.

You know, it's hard as a writer to lose characters (and actors) you like. You really don't want them to die because you're not going to get to see them anymore.

What happens is that as the scripts are rewritten and re-edited in order to make the story more compelling, you sometimes end up with what you could call a time singularity - where there's no way for everything that happens to happen in real time. It's something that you need to wink at.

To create a situation where each new episode has to start in the exact same place as the previous one, with the actors' hair in the exact same place, seemed crazy.

I actually started in the opposite place. I come from a technical background - I'm a mathematician and a programmer by trade - and I was one of those people who would watch a show and say, Oh, that could never happen.

My background is in math and science, and I thrive on complexity, and I think lots of people do. People love puzzles it's human nature to want to solve puzzles.

I think ultimately what makes the show is not the reality but the drama.

What you have to get used to as a writer is realizing that most of what you come up with is wrong for the show.