She seems to be the one who can use that stuff. My guess is that she will need to use said sword. Also found it weird this is called the csreful emptess, even though FL is only a queen
@MistressC
It may be related to the fact that he was moving, but from the recent chapter is seems that it was related to Helen somehow. The Implication seemed to be he was scared Karen will bully Helen.
Also thank you for the translation. This is surprisingly interesting.