"The longer we stand here talking, the more danger Anatoly's in," Joan replies. It's not disagreement at all. Arthur knows her well enough to read her taking his assessment into account and moving on.

She leans in and up to kiss him, not quickly. There's danger here and she is willingly putting herself in its way for a man who isn't her husband. If he loses her, she doesn't want his last memories to be that she ran off to save a friend without a thought for him.