And Steve wanders around lost. He's lost the two people he knew and loved the most...Bucky and Peggy. He meets Sam, who is the perfect balance of calm and sass and he works with Natasha! But he is really this stubborn guy with his own beliefs who will do things his way.
And they fight. At first, Steve has no idea who he is up against.
The Winter Soldier has all his skills and strengths. Then he realizes...
His mind is so strong that despite the wipes he remembers his friend Steve. But it takes more than that to release him from his conditioning. Steve is too stubborn to let go and he makes the ultimate choice.
"I will not fight you!"
And then he remembers, and oh god the music is so heartbreaking and Steve falls to his death, but Bucky can't let that happen a second time. Can't let someone fall, he must protect Steve....and so he plunges into the Potomac.
End credits show a free Bucky at the Smithsonian, he's trying to view himself and he looks quite pensive.