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We were fine at the beginning. [He hesitates, not entirely sure Steve even knows -- although maybe it's another one of those things that will just be different in their worlds.]
In 1991, HYDRA sent the Winter Soldier after Howard Stark. He'd managed to replicate the serum. They wanted it. Steve killed him and his wife Maria.
[He grimaces, flexing the fingers of his left hand absently.]
When Tony found out, he tried to kill Steve. I got in the middle. Tony saw it as a betrayal. Blasted off the arm SHIELD gave me. [He shrugs. It had hurt, but the thing had been god-awful heavy.] Princess Shuri made me a new one, made of Vibranium. Like the shield.