Yeah, that's - [Erza sighs.] How this place works, sometimes.

Ok. The sword is an option. I think it should work at least temporarily, even making a....very quick cut, so to speak.

I unfortunately don't know of any other ways to sever a bond that would work in this situation, and I did a lot of research on blood bonds, at least, before I found out how the sword works.

Picking who you want to wield it, also options.