This is where his demons hid, just under the surface threatening to break loose,to let all hell break loose and then just walk away.
He didn't want their help. He didn't NEED their help. He just wanted to be left alone with his demons.
"Leave me alone," He growled slamming the man against a brick wall, a knife pressed against the man's throat.
"Buck, you know me," The man choked out.
"No. The. Hell. I. Don't." Bucky snarled, "I don't know why I let you live, why I walked away. But don't make me regret it."
"Buck, please," The man pleaded. Bucky re-sheathed the knife and stepped away from the man.
"Go." He hissed, "Just, go."
The man stepped closer, "Buck-" he began but didn't get to finish as Bucky spun, slamming his silvery left fist into the man's jaw, sending him sprawling.
"Last chance," Bucky said coldly, "Walk away now, and you have a better chance of staying alive than if you stay and keep annoying me."
Finally, the man slowly backed up and walked away.
Steve was hurt.
When Bucky had saved him from drowning he had thought that the ex-assassin remembered him. But after this encounter, it was obvious. Bucky didn't remember, and didn't want help.
It hurt to see his friend like that but he had to respect Bucky's wishes.