It had only happened the night before, and it didn't seem possible she could know.
He was quite right.

It wasn't possible she could know, and she didn't know.

She only divined.
"I knew when you made the promise you couldn't keep it; that's why I forgive you now," she added.

"Knowing what I did about you, I oughtn't to have let you make it." The Young Doctor saw in her words a meaning that John Sibley could never have understood, for it was a part of the story of Crozier's life reproduced--and with what a different ending!.