The video is actually recent and taken from Bucky's point of view. He's sitting on a table in Tony's workshop and Tony has his arm open, repairing it. They aren't speaking and Tony won't look at him. Bucky reaches out with his other hand to try and touch something glowing on a table across from him before Tony slaps his fingers.
"Don't touch my stuff."
Barnes doesn't respond and just looks back at Tony working on his arm before the engineer closes it up and starts to walk away, presumably to get something to clean the grease off of his metallic limb. Bucky's vision moves from the back of Tony's head, and then to the glowing thing on the table. Back to Tony, rummaging through a drawer on the other side of his lab, and then back at the glowing thing which, in Bucky's defense, looks like a very interesting glowing thing.
Back at Tony.
Back at the glowing thing.
Back at Tony.
Back at the glowing thing, and this time his organic hand slowly reaches out to touch it-
There's a sudden hissing sound and the glowing thing, whatever it was, suddenly propels itself off of the table at the opposite wall with thrusters that Bucky didn't know it had, and after flying around in the air it collides with one of Tony's machines in a small explosion.
"Shit. Shit shit shit shit-"
"BARNES!"
"Shit shit shit shit-" Bucky suddenly stands and starts to run for the elevator, mashing the button to try and get the doors to open. He looks over his shoulder and Tony is swiftly walking toward him, the hair on the side of his head a little singed with fury in his eyes. Bucky looks back at the elevator when the doors open and he runs in.
"Shit shit shit shit-" "I am literally going to beat you over the head with your own fucking arm-" "Shit shit shit shit shit-" he's pressing the 'door close' button frantically as Tony advances, and the doors finally shut before the man reaches him. The elevator starts to move and Bucky is silent for at least thirty seconds.