User blog comment:IamJakuhoRaikoben/Chapter 356: Tartarus Arc, Review./@comment-85.150.136.163-20131018154450/@comment-7418318-20131018162159

I think it rather shows off just how weak and useless the rune knights really are, once again.

This time the attack came from the outside, rather than betrayal from within like in Ultear's case, so it means the guards of the commpound were either criminally incompetent and didn't notice the invader or more likely just too weak to do anything about it.