User blog comment:Caudyr/Abilities List From the Author + Translation of Abilities as I go Through the Story.../@comment-27061613-20151113075605/@comment-124.83.16.225-20151113093950

Yep. It's perfectly in keeping with the Gemini boss' theme of duality. It'd make sense for a boss like that to require having both its halves be destroyed at the same time.