Thrawn gave a few final words, "Remember, take your studies seriously, sometimes being unorthodox may get better results, and don't be afraid to ask questions." That last one was said while looking straight at Luke yet again.

Upon dismissal of the students, Thrawn stayed behind as they filed out into the hallway. He waited until Luke was close enough, before addressing him, "Just a moment. If I may have a word with you?"

Thrawn had obviously taken a bit of an interest in him. He'd been the most attentive of the lecture, and Thrawn wished to speak with him without the professors glowering at anyone. Even if said professors likely thought that Thrawn intended to scold Luke.