Bucky thought it was totally irrational, outrageous. Out of everyone to do such a thing like that, you were the last person he expected, the last person he wanted to do that.
You both totally hated each other’s guts, always at each other’s throats about something or another. That made missions somewhat tricky, but Bucky made a point to stay on the other side of the battlefield from you.
That was until he was surrounded, a bullet aimed straight for his head that you took. You took a bullet for him. He was furious, furious that despite your clear aversion to him, you had the cheek to do something so rash as saving his life. You bled out by the last shred of life for him, hanging on by a thread as the nurses rushed to your aid, all of that for him.
The moment you were healed and out of medical care, Bucky took his opportunity to confront you. He’d felt angry before, of course, but this type of anger was confusing. He wasn’t sure if he wanted to thank you or punch you. He despised you, he despised that even if you truly hated him, you still had some respect and kindness in your heart to risk your life for someone you always made a point to avoid in any other circumstance.
He quickly approached you as you entered the lounge of the Compound, boxing you in between himself and the wall.
“The hell were you thinking? Are you stupid?” He started, giving you no room to reply as he continued. “Try something like that again and there will be hell to pay.” He added with an irritated twitch of his lip, eyes narrowed as he harshly poked your chest.