And the neutral expression vanishes like it was never there at all. She's scared - scared for him. Guilty for dragging him here, for wanting to keep it from him, for wanting to keep him here. A moment ago, this was so simple. She'd want to know, so she'd tell him. Now she has a choice, and she doesn't want it.

"I... Yes. It's something big. And I couldn't... Steve, I can't let you go back without telling you. I just can't. If you want, I can wait until we think we'll be able to send you back. If you don't go back, then it doesn't matter. But if you do, you need to know."

Whether he should is another matter, and she's not sure about that, but she can't keep this from him. If he knows, even if it's true... maybe he can change it.