[Everyone keeps warning them about spirits, especially Keeper. And while he almost hates her, he figures there's some kind of truth in what she says. Maybe.]

They can be manipulated by music. [They got those ocarinas, but Ignis didn't use his much.] So yes, they are mysterious and hard to work with. [One can't know when the spirit will just turn around and attack them. Because that's what happened when the horn went off last time.]

That I did not take into consideration. I've seen couple of people arrive though.

[And while they keep coming, it's still not in quantity of the first night when he arrived. Maybe that's for the best.]