It is not so much illogical to have her killed as it is rushed. I can see it happening if it took, say a fully two or three volumes to develop to that point, but to have it happen only one volume after they are reunited (less than one, if more than a chapter or two is a flashback or otherwise a review of the end of the prior blade dance) is just too soon. That said, it could be that the editors pushed this, either due to feeling that Restia was taking too much of the lime light or due to wanting to bring her dramatic end sooner for the shock value.
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