There's a long pause where Anna just looks blank, and she's about as clueless as Steve with this device in Tony's chest. It's not like she doesn't understand technology, it's almost the opposite. She's had time to watch technology as it is come into complete fruition, and watch every single development as it's been made. The arc reactor is entirely new though, and that's mostly what catches her off guard. Nothing is new any more, not when you've lived as long as her.

She does catch on though, eventually, because despite being slow to the uptake she sure as hell isn't stupid, and it's easy to tell when she does realise, because there's a frown on her face almost instantly. She leans slightly closer, looking at Tony with obvious concern. "What happens if you try to fix it?"

Steve's becoming more of a concern with each passing moment though, and she barely waits for a response before she reaches out to catch hold of his elbow and stands. She has no issues with holding his weight, and tips her head slightly to look at that tired, exhausted expression with concern. That's not the Steve she'd seen at the lighthouse, by any means.

"He's not going anywhere." Her eyes are still on Steve's, but the words are directed at Tony, and she's still frowning as she steps back. All of a sudden her voice is much more decisive, and even though she's stepping back she's still not-so-subtly guiding Steve to a chair (or the bed, whichever he ends up in first, really) with that hand on his elbow. "Neither of you are, you're both staying here until you're actually in some kind of fit state to move unattended."