Kai was worried that the other students would know that he had been arrested, which wouldn't do well for his reputation.
Luke assured him that would not happen, "The classes are suspended for three days, but I bet it will get suspend for a whole week. So you won't be losing any classes. Also, I will make sure no one knows about this."
Professor Luke didn't think Kai had done something to Edgar, but he had to follow the orders and the procedures. Kai understood that very well.
"Thank you for this," Kai said, "I will try my best to help with the investigation. Also, now that we are here, there's something I need to share with you. Are you sure we are alone here, and no one is listening?"
Luke got serious. "Yes, this place is safe to talk. What is it?"