Empire has released a feature for Avengers: Endgame, which features the filmmakers, and writers, Christopher Markus and Stephen McFeely, giving some comments on the film’s most important moments and plot points, especially the scene involving Tony Stark (Robert Downey Jr). Director Anthony Russo said:
I think that was one of Downey’s most inspired performance moments in the movie. He very much reverts to, this is the guy who felt forsaken by his father – you can see his intimacy and trust issues in that moment when he turns on Cap. Downey performed the scene with a lot of energy. We didn’t do it many times, because he was expending himself so, so much. He understood it very well.