He saw it.

"Rise up," he said, "and act.
Tell me all the circumstances.

Is it too late ?" She told him how it had come to pass, and then he showed her that all her terrors were but anticipations, and might be false.

He got her pony for her, and, as night was falling, rode away with her along the mountain road that led to Captain Brentwood's.
The sun was down, and ere they had gone far, the moon was bright overhead.

Frank, having fully persuaded himself that all her terrors were the effect of an overwrought imagination, grew cheerful, and tried to laugh her out of them.