[Dead Cake]

Originally Posted by GDB

Spoiler for Manga?:

I'm pretty sure it's flat out stated in the manga (back during those flashbacks of his training/Ishval that got skipped over in the anime) that she had Roy scar her back so that "another Flame Alchemist could never be born into this world." Of course, my memory could be failing, but I believe this is what occurred.

I'm hoping this scene will be in the beginning of next episode or 54. Then it'd make sense why they skipped it earlier...