"Natasha."

It's the only thing he says for several seconds.

He's watching her, brow beetled. It makes him look severe, but right now he's just trying to come to grips with what she's just told him.

He doesn't ask her. He doesn't have to. He knows exactly what she's saying, and if she's half as good as she says she is, she knows he understands. There is one question she can't scoot by, however.

"How?"