Sebastian smiled when she said he was persistent. It was true. He was a very difficult person to say no to. He assumed it was just a habit of his, maybe something he'd gotten from his mother, a kind of tenacity that took him over when he was really dedicated to something. Right now, he was dedicated to help Grace overcome her fear and learn to control her powers. 

"Yup. I won't take no for an answer."

Finally she gave in, probably seeing that there was no point in arguing with him. She seemed reluctant again to touch him, but like before, nothing happened to him. He smiled, seeing that he was right that she had the power to control her abilities, and when he felt her grab his hand, he took them to the lecture hall.

He obeyed her when she told him to move over to the side of the room, and when he was there he put up a thumbs up sign. However, when she voiced her concern over whether she would get in trouble, he waved it away. "Yeah, sure. It's fine," he assured her, but he actually had no idea. He wasn't an employee of the school, so he really doubted he had the authority to allow a student to freeze an entire lecture hall. But his curiosity to see Grace actually actively use her powers surpassed his thoughts that what they were doing could get them in trouble. 

"Go ahead, Grace! Let's see what you can do!"