However, this separation into two acts is only a suggestion, as the film does not have a plot that proceeds in linear fashion. This lack of narrative development corresponds with the film's use of long tracking shots that show the characters' movements in the building. These tracking shots evoke tension (because the audience knows that a shooting is about to happen) and frustration (because of the lack of typical narrative progression and the characters' entrapment in their mundane lives). Although the characters are in constant motion, they do not develop from a dramatic point of view. As a result, all characters remain flat and one-dimensional throughout the film, and the audience never fully understands their motivations. The film only shows how sudden, random, and yet horrifying a school shooting is.