C-light said:
This comes from touhou 19, specifically Orins story mode I believe.
Orin has an ability that turns the fairies - the common fodder enemies of the game - on her side of the screen into Spirits, which are more damaging to the enemy when she destroys them. However, Zanmu's ability basically causes all of the spirits on your opponents side to, in technical terms, shit danmaku everywhere.
This means Zanmu is a HARD counter to Orin, as she turns orin's attacks against her.
Touhou 19 balance makes me want to laugh and bury my head in my hands at the same time.