For a kid who's 11 and 3/4, Mark is surprisingly desensitized to everything going on around him. Between the things he witnessed and the things he did, he didn't show the slightest bit of fear or shock. His kill em all attitude was really hard to believe. None of the characters seemed to really show any reaction to the fact that their entire town was being eaten by vampires, they just seemed to be rushing the plot the whole time.