initially thought my experience with zombie movies is you just let them do whatever they want to do. George [Romero] always said, 'You show 50 people one movement, then you have 50 people doing all the same thing.' So we sort of just lined them up and said, 'Let's see what your zombie walk would look like,' and then they would do it and we would say, 'Try this or try that.' You know, sort of fine tuning everybody." Alongside with Frank Darabont, Nicotero had previously collaborated with Romero on several occasions, and looked at the structure of the zombies in his films for inspiration. "It's not that I'm against [fast zombies]. It's just not what I grew up with. It's interesting, too, because a couple takes we did, where a couple of the zombies kind of broke into a run, and after one take Frank's like, 'Did they run too fast? They shouldn't be running. Slow them down.' This is trying to be creepy and moody and, you know, you're building up all this kind of scary tension." In April 2010, The Hollywood Reporter revealed that Jon Bernthal and Andrew Lincoln were chosen by producers for the main cast of the series. Bernthal was to portray Shane Walsh, while Lincoln provided the role of Rick Grimes, the central character of The Walking Dead. While Gale Anne Hurd didn't expect to cast Lincoln, Robert Kirkman was ecstatic with his acting, evaluating him as an "amazing find". In his interview with Dread Central, Kirkman added that "writing Rick Grimes month after month in the comic series, I had no idea he was an actual living, breathing human being, and yet, here he is. I couldn't be more thrilled with how this show is coming together." Although he was initially shocked upon hearing of The Walking Dead, Lincoln thought the episode's script was well written. "I read it and thought it was well written, and I put myself on tape just for one scene. I didn't know who was involved at this point." The succeeding day, his agent called him about the development of the pilot. Lincoln described the moment as "kind of like a dream list". He later communicated with Darabont via Skype; "We spoke for about 40 minutes about his ideas for the project, about what I liked about Episode One and then he asked would I fly over to