When Syro came to class he had looked around to find this favorite student of his, but he didn't see him. So he quickly checked the online attendance records and was a bit relieved when he saw that Aether was marked present for this class so he had probably went to the washroom or maybe grab a snack. But 15 minutes passed by and the student didn't show up, but when he did he looked like he had just woken up and rushed here. His eyes were still sleepy, but they suddenly turned sad and angry like somehow he was offended.
Syro was instantly able to understand what was the student thinking, as for how he was able to understand; Syro didn't think much of it because it felt natural.
Syro also noticed how the student was not focused at all during the lecture and was angrily scribbling away like something had occupied his mind.