"I've seen only one person who can do it," she explained. "She seems quite strong, perhaps because it is better defined as 'changing boundaries,' which is already something with a quite wide range of effects." Well, she didn't know that much about Yukari, she suspected. Not that many encounters with her.

"Originally I lived on Earth with some of my fans, but we had our mansion transported to Gensokyo about ten to fifteen years ago. Living in the world of humans did not seem like such a good idea." Let's just assume she explained Gensokyo earlier.

"I guess it just means we just like to get into fights that much and don't want to stop, I guess. Also, it means we don't have to rebuild anything too often if any of us uses anything too destructive." Patchouli was not bound by the spell card rules here, so maybe Iri got to see her blow some things up already and just generally show off some of her spells with a larger area of effect.