It makes him wonder what they're even learning about the experiment. What did it matter outside of fooling the train? How good they were at sneaking around or finding things out? It has Tidus frowning, parts of this whole situation plenty confusing, but he looks over to Wangji at the question.

"Out there? Just really dark, and hard to move around. We were getting chased around - you heard them, right?" Before Wangji got taken? "Some kind of invisible fiends - 'cept, I guess they were how the Inspectors were grabbing us."