Rumble. A faint vibration rode on the wind and spread across their surroundings. Nobody could feel it, but Ru Amuh with his especially keen senses came to a stop and turned around. For a while, he simply stood there.

“Huh? Ru Amuh, what is it?” Ru Hiana also turned to see what he was looking at. “Is someone following us or something?” Seeing nothing, Ru Hiana raised her head and looked up toward the sky.

“What did you see—” Ru Hiana trailed off because she saw something strange. A part of the sky was bright even though it was nighttime, and that particular spot was brightening and darkening again and again like there was a lightning storm coming down. The two fell into silence upon seeing the strange phenomenon. And as the two people in front of the line abruptly stopped, others also began to turn their heads one by one. Soon, they had all noticed the flickering sky and were staring at it blankly. At once, the same thought passed through everyone’s mind.

“Teacher…” Ru Amuh muttered. Even without finishing his sentence, everyone knew what he was meaning to say. Where was Chi-Woo, and what was he doing right now? And how intense was his battle that they could see its effects from here? 

“…It’s time for us to go,” Zelit spoke. “Let’s believe him and do our part. That's all...