This seems to present a unique challenge, because he’s the same guy, and yet he’s not the same guy. How do you maintain the consistency between the two performances?
You have to maintain that consistency. The Bucky who I saw in the screenplay – different from the Bucky in the comics – is a guy who does the right thing, but who doesn’t always know how he feels about his role. He wanted to be gung ho, like Steve, but he always had a darker side. A little resentment, a little chip on his shoulder. I saw that in the first film, and that got me thinking about what his dark side would look like. You had to see it, but he still had to be the same person. And those things were real, especially in the dynamic of a friendship. He knows this guy Steve Rogers, who’s a great guy, but kind of the little brother that Bucky’s protecting all the time. Suddenly, he comes back as this demigod. So there’s some resentment there. Some envy. Steve gets to be this decorated super soldier while poor old Bucky’s getting tortured by Hydra creeps. It’s going to put a little venom in your glare. At the same time, you had to keep the friendship, and the real camaraderie they had. You have to see it in glance, in flashbacks. It has to be there, only now it’s the thing you’re spotting out of the corner of your eye.
Sebastian Stan on Bucky’s mindset when he decides not to let Steve die