Starting with a full-color illustration showing the desired results (a bird's-eye view of the town under siege as a car explodes in a gas station), Bob then stroryboarded the various pieces needed to make that composite. That entailed everything from a backlot gas station to a down-shot of diving birds to a matte painting of the entire fictional town. To complicate an already difficult shot, Bob also had to coordinate lines along with the soaring birds. The shot is all the more remarkable when considering the absence of the digital technology available today.