Maethion was confused about how Clyde knew about that. About something that should only be known by parties within the Celestials' circle of followers.
He was one of the people who knew about it because he was in the Senior Council. His colleagues in the Senior Council are spies in the deepest circle of Celestials, some even occupy high hierarchies there. Of course, he would know about that.
However, for Clyde, someone who has only been in the Fortress for a few months already knows something like that... its very strange and could become something big in the future.
But for now, Maethion thinks that what Clyde said is true. He had to start ordering them to move out on expeditions when the situation was tense in The All Territory.
"But Clyde," Maethion said. "What happened over there seems to be something different than before. After a very long time, there is finally something that can make those powerful Celestials feel threatened."