Yin closes her eyes for a moment, trying to guide her specter, leading it with Waver's explanation. She might still not make it, but she was going to try.

And if it was unguarded properly, then maybe Yin should put her specter there sometimes.

"Mirror.... You can just fall through mirrors here?" That is something Yin thought only happened in stories. Clearly not.

It's a very good warning, considering she hasn't met that side of herself, but in her, without a mirror, is the potential for something very dark. She would be a shock to anyone who knew Yin.