Though Captain America: Civil War keeps the relationship between Steve Rogers and Bucky Barnes at the heart of its story while balancing its ensemble cast, the film still couldn't fit in every story beat the Russo brothers had in mind.

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Joe and Anthony Russo, who directed Civil War and are also on board for the next two Avengers films, recently spoke to IGN about the sheer challenge of balancing the film's expansive cast and story. Some things had to be cut in the process, and in particular one extracted scene had its roots in the characters' coming book history."There is a scene that is a cut scene. It's a small piece of the fight at Leipzig where there's a very fun interaction between Cap and Bucky, and it kind of hints at a favorite storyline in the books," Anthony Russo said. "I won't go into the detail about it, but there's a little tease in that scene that is pretty fun."The Russos didn't elaborate on what the story being referenced is, and that's because they cannot yet say whether it wont factor into their future plans."It's a comic book story, and I can't say whether or not it's going to factor in to the movies," Anthony Russo said when asked for specifics about the scene.The Russos did speak to IGN at length about the process of making Civil War. The two also discussed their work so far on the upcoming Avengers: Infinity War and its now untitled sequel, including how the films set the stage for certain beginnings and endings within the Marvel Cinematic Universe.The Infinity War writers Christopher Marcus and Stephen McFeely, who also scripted Captain America: Civil War, offered an update on the progress of the Avengers two films' scripts Captain America: Civil War will arrive on on Digital HD, Digital 3D and Disney Movies Anywhere on September 2 and on Blu-ray 3D, Blu-ray, DVD and On-Demand on September 13.

Additional reporting by IGN Entertainment Editor Terri Schwartz.Jonathon Dornbush is an Associate Editor for IGN. Find him on Twitter @jmdornbush