I mean, the knife was made from the broken blade of a holy sword, reforged through a magical forging skill, and baptized in a magical space-time kitchen that imbues anything there with special properties. So I really ought to have seen this coming.
Repeatedly told, "do not show off your skill." Or you will be used up by the unscrupulous. Shows off skill to more and more people. Flashily so. So I assume within 3 chapters it will get out to these people with no scruples we have yet to even see a hint of.
lol god I went back to reread the previous chapters, and chapter 7 straight up foreshadowed the holy kitchen knife. I didn't know you could foreshadow comedy. XD