It's something they can do naturally. I can't say why it's hiding now, though. Unless it's just really shy.
[Now that Sora thinks of it, the Spirit's behavior reminds him a little bit of a skittish cat in a new setting. He could recall his father bringing home a stray cat once. Poor thing had been so nervous the first couple weeks she'd hid at every little sound and was still very shy after that.]
... Why is this game creating so much head canon?
[Now that Sora thinks of it, the Spirit's behavior reminds him a little bit of a skittish cat in a new setting. He could recall his father bringing home a stray cat once. Poor thing had been so nervous the first couple weeks she'd hid at every little sound and was still very shy after that.]