User blog comment:Real Godisme/The Ultimate Review - Week 8/@comment-7418318-20141122184903

In Magi I found it a bit unbelievable that Arba (I prefer her old name, so much easier to spell and remember :P ) didn't notice the "infection". Those clones are supposed to also share their black rukh with her, not just with each other, right?

But considering how little damage she took from the clones, maybe she did know and just pretended to be taken by surprise, so she could get Judar's and Hakuryuu's hopes up only to crush them right down again for maximum psychological effect.