Method Studios, which worked on 440 shots, was responsible for the helicopter sequence in the middle of the film and the climatic fight between Iron Man, Bucky, and Captain America. The original intent for the helicopter sequence was to place the scene next to the Paul-Löbe-Haus, where the Bundestag meets; however, the location was not allowed to be shown in the film, resulting in Method needing to create a full CGI background. For the climatic fight, one of the challenges for Method was getting the color of Iron Man's suit correct, opting to go with a more "classic Iron Man look versus the really glossy car paint look" that Iron Man had in the previous Avengers films. ILM was primarily responsible for the visual effects during the large-scale fight sequence at the airport, along with creating the digital assets for all of the characters. VFX supervisor Russell Earl, stated that the 20 minute scene grew to be an almost fully digital sequence explaining, "We ultimately ended up replacing 99% of everything that was shot with the actors being lifted from the background. Originally both Spider-Man and Black Panther were planned to be photographed elements but we ended up almost completely replacing them." Luma Pictures, who also worked on Winter Soldier, was assigned with completing shots of Bucky's arm and his metal brainwashing chair. They also worked on Bucky's escape from the task force lobby and designed Iron Man's new hybrid nanotechnology armor, which was an homage to the character's Bleeding Edge armor from the comics. Their work totaled approximately 200 shots.