Bucky! is what Steve means to say, but certainly before he can even open his mouth, he's dragged inside. Anyone else he might fight on it, but it's Bucky - is it Bucky? It is, right, it's Bucky - so he doesn't fight it, lets the other drag him inside, eyes wide, heart still pounding.

Once the door is closed behind them, his fingers curl around the metal forearm, not squeezing or pushing, but just holding like he's not sure if Bucky is going to fight him or run away. Or maybe one and then the other. "Bucky - what the hell is going on?" he hisses.

Please be Bucky, or this is going to get really weird. (It's already really weird.)