This is my first fanfiction and so don't be too harsh! but I would love some constructive criticism.
'I'm with you 'til the end of the line, pal.'
Those words make him stop. He's heard them before, a lifetime ago. He looks down to Steve's bloody and beaten face and then he remembers. Not everything, just that day, that one moment. Then he feels himself moving and scrambles back to safer ground but a piece of steel comes tumbling from above them and smashes the panes that Steve is on and it breaks and he falls down, down, down and then the Winter Soldier remembers another memory of Bucky - of himself falling and Steve's desperate, anguished cries of pain. And so without thinking; he falls, this time on purpose, to save and not destroy.
He braces himself for the impact but it still punches his breath away and it takes him a moment or two to figure out why he is down here until he sees a flash of metal and stretches out his metal arm to clasp the forearm of his…. friend. He pulls him closer and swims towards the surface. When he breaks the surface he can see the bank in the distance and slowly begins to swim towards it, Steve on his back. After a while his body hurts and he is tempted to drop the heavy weight on his back but he has another memory, of Steve getting beaten up in alleys, parking lots and behind diners and him always looking after him and he realizes – he can't. This is-was-is his best friend, his little brother and he has to look after him. And so he struggles on. When he finds the ground, he has to drag Steve behind him as his arms are almost useless. The Winter Soldier places his friend on the bank and Steve takes in a gulp of air and continues to do so. After making sure that he will be alright, Bucky sets off down the bank to begin to slowly piece back his life together.