Possibilities

 Zaos' unit only heard what happened one week after the incident. Despite the fact that they almost were buried alive, Vitalar and his men managed to escape since Zaos attacked one of the sides of the avalanche and enhanced their movement speed.

"What did you say?" Cohnal asked with his eyes wide open due to the Shock.

"I won't repeat myself," VItalar said. "Now if you excuse me, I have many things to prepare since we made a huge discovery."

"You at least tried to look for him?" Melisse asked. "He was caught covering for your group."

"We didn't have time, I won't deny that we survived thanks to him, but we couldn't wait," Vitalar said. "The enemies were climbing down the mountain and their base was nearby, so it was too dangerous to stay nearby. We needed to report this discovery, after all."

"Zaos…" Nyana said with tears in her eyes.