Grace paused for a moment and gazed at Heinz. She wanted to scrutinize Heinz's emotions, to see if he had already known something.
But on second thought, Grace felt that she might be thinking too much.
"How could he possibly know?" She thought to herself,
"Yes, Heinz shouldn't have known because no one told him. Could it be... he noticed something?"
Nevertheless, she told herself that Heinz would have questioned her the moment he suspected something since he was so impulsive.
Then, why did he bring her here without saying anything about it?
Therefore, Grace came to the conclusion that it should be a mere coincidence.
She felt that Heinz didn't know anything about that night.
To her, that night was just an incredibly embarrassing memory anyway.
Since she wanted nothing to do with him, she didn't want to bring it up again.
The only way she could make Heinz give up on pestering her with questions was to irritate him.