User blog comment:Maki Kuronami/Preview of Episode 8 from PAX/@comment-3146930-20130901212706/@comment-9090085-20130902002000

Perhaps it's in a "nook"? It appears to be surrounded by cliffs with only one side opening towards the forest; you'd probably have to be in a relatively isolated section to see into the "nook". It also appears to be shrouded in fog, which would likely increase the odds of students missing it the first time around.

Or, maybe the "Roc" will be the outside force to move them?