Mat gratefully sinks into Jesper for a moment, the most pressing danger passed for now. They are on high ground. It's something.

"I have no idea. I...don't think this is anyone's domain but...what else could it be?"

It's the Horizon. It's not even a real place! Nothing exists in it that one of them didn't make...right? Thinking on it, the situation is worse than he'd thought.

"Maybe...maybe the Singularity's having a fit again. And dredged a bunch of nonsense out of all our minds and tossed out whatever mad jumble that made." It seems as good an explanation as any, but Mat's just grasping at any idea that makes sense.