The mood was so alien to him that Tuppence turned and stared at him in surprise.
It was grossly out of character for him and startled Tuppence to the point that she just gaped in disbelief at him.
mnli hypothesis: It was grossly out of character for him and startled Tuppence to the point that she just gaped in disbelief at him. premise: The mood was so alien to him that Tuppence turned and stared at him in surprise.