As awful as he looked coming off of the table, Bucky seems to recover pretty quickly. He still staggers a bit, but he's able to walk on his own feet after a little while, and while the mildly dazed look never leaves his eyes, he seems to be able to focus on Steve's face when he looks over at him, and that's progress.

Steve jogs to a halt for the third time in ten minutes as Bucky weaves sideways behind him and ends up leaning heavily against a wall. His face is pale and the shadows under his eyes are more pronounced, but he looks steadier than he was.

"What'd they do to you?" Bucky asks quietly, head tipped against the cold metal of the wall.
When Steve doesn't answer, he rolls himself until his back is braced and slides down to sit, knees crooked up to rest his arms against. Bucky looks exhausted. "Jesus Christ, Steve, please tell me I'm hallucinatin' this…"

"Bucky-"

"I can't trust anything I see." Bucky's hushed. He sounds broken down, just this side of hysterical. "I don't know what the fuck they did to me in there, but I been seeing shit for days, so I ain't in the mood for anymore imaginary bullshit right now."
Bucky's chest is heaving and he's getting visibly upset.

"Buck, I'm real. I swear to god. Ask me anything. I'll prove it to you. Just we gotta keep moving."

Bucky shakes his head, slumping a little where he sits. He raises his eyes again, fixing them on Steve like a needle through skin.
"What. Happened?"

"We don't have time for-" Steve starts toward him, freezing when Bucky's chin comes up and his eyes don't waver.

"I'm pretty sure I just walked outta actual literal hell, Steve." Bucky's unsteady gaze is cold and piercing on him. "And while I 'preciate the help, I'm not goin' anywhere until you tell me what the fuck happened t' you!"

Steve blinks, chewing his lip indecisively. Shouting seems to have worn Bucky out. His shoulders are heaving as he works to catch his breath. They don't have the time and Bucky doesn't have the strength to sit here arguing about it.
He'll stick to the abbreviated version.

"They gave me a serum that changed me." Steve tells him, crouching down beside his friend. "Put me in this big metal box and made me stronger. Made me healthy for a change. They fixed me…"

Bucky stares at him.

"Weren't broken." He mutters hoarsely.

"I wasn't much good the way I was."

"You even know what they gave you?"

Steve looks away, and he can hear Bucky's quiet snort of disgust.
"Nobody does. That's kind of the problem. They can't replicate it."

"Goddamn it Steve…" Bucky breathes, sounding like the effort hurts him. He starts to struggle up to his feet, accepting Steve's hand up as they lurch into motion again.
"When'd all this stupid happen?"

"Well...you remember the Expo? How I said I was gonna try my luck?" Steve averts his eyes.
He hears Bucky's sharp intake of breath, followed by a hacking cough. Fortunately, it lasts only a moment.

"You sneaky little son of a bitch…" Bucky mutters, stumbling for a step before he regains his footing. "I leave you alone for an hour…"

"I'm sorry I didn't say anything, but I knew you'd skin me if I did, and you had so much other stuff to worry about…"

Bucky is quiet for a long moment as they round a corner and head toward the center of the facility. Their boots clattering against metal flooring echoes through the empty hallways.
They've got to find the others and regroup to make their escape. Every moment they spend here is another moment that much closer to death.

"Did it hurt?" Bucky asks suddenly. He flinches and winces at the sound of his own voice as he asks, and Steve can't help but wonder, not for the first time, what Bucky's actually been put through. He tries to keep his voice light.

"A little." more than I thought I'd be able to survive, but hey, look at me now!
Steve is careful what he omits from his answer.
Bucky's already furious at him, there's no need to make it worse.

"Is it permanent?" Bucky stumbles a bit, following Steve down the next hallway.

"So far."

Bucky looks like he has more questions, one of which being 'what the goddamn hell were you thinking?!' if he knows that expression as well as he thinks he does, but they're interrupted by a series of explosions beneath their feet.

This place is coming down. They need to get out NOW.