Calling all Twilight fans! If you are planning to pick up The Twilight Saga: Breaking Dawn — Part 1 DVD (available Feb. 11) you should know that there’s an entire second disc of bonus features, including a six-part documentary that chronicles the ins and outs of this very action-packed (Marriage! honeymoon! pregnancy! totally insane birth!) movie. In this exclusive EW clip, it’s all about the wolf pack and their climactic battle with the Cullens towards the end of the film. (And if you don’t want your wolves-are-real illusions shattered, we suggest you don’t continue onward.) The choreography and special effects and stunts were all carefully thought out and planned to the very second in order to make the scene look as realistic as possible. Funny then, how hard it is for the actual actors to pantomime fight scenes versus the air, or in some cases, a not-so-ferocious beanbag. My favorite part? Watching Jackson Rathbone (Jasper) explain that the hardest part in shooting these dramatic scenes is trying not to laugh. Take a look below.