reoccuring occurrence

Curtis was back still that didn't mean their problems were completely solved. They still had the missing Philip to think of rescuing. This was just an unpleasant reoccuring occurrence.

"You said you saw their lair?" 

Curtis nodded. "It's not far from here. There is a bunch of trees clustered together, their branches form a sort of land in the sky. Those creatures stay there. If you're thinking of going there then I'll say you might have to give up. The lair's security tight. The trees are high up in the sky. They seem to be the tallest trees in this forest. You could see the boundaries of the forest and even the lands beyond from the top of that tree. you'll need a small plane to get there except you can climb and spin webs like them. Plus their populations is one you can not trifle with. Once you get noticed, it'll be a whole lot of effort to escape."

"If it's that hard then how did you get out?" Alia asked skeptically.