User blog comment:Yuri Rozu/Fairy Tail Chapter 502 Mavis and Zera/@comment-62.113.28.119-20160924094005/@comment-136.179.21.68-20160924172201

Well, remember that Porlyusica did analyze demon blood to make a antidote to Magic Barrier Particles. So she must have some sort of familiarity of Etherious Anatomy.