Board Thread:General Discussion/@comment-6192846-20130913170916/@comment-6192846-20140603120139

I haven't found references to Irina's body being her former subordinate or mention of the baby having a bruise (though checking it now, 痣 might be better translated as birthmark instead) in the light novel itself so it seems this just extra stuff mothy's mentioning about the characters to give more clarification.

Speaking of the former subordinate issues, whether knowingly or unknowingly, I think it's safe to say I.R. set up the fight between them so she could publicly appear dead and then took up the new alias as "AB-CIR" to keep up the idea "he" was a powerful mage who defeated the evil sorceress and could be trusted.

We know Elluka was aware of her existence in Lunacy and if Haru was the reason she had to switch, this was the best way to make her look gone for good.