The Seidel Kingdom was not a strong state. That was the first and most important problem with following someone's footsteps outside of this state. If it were hard enough to do it inside the kingdom, it would be much worse to do it outside, with more dangers, expensive service costs, and much more.
Not only that, but while there weren't many special magical creatures in the Seidel Kingdom, there were areas outside of it where all kinds of creatures were present.
From goblins to trolls to vampires, they were out there!
If Casey wasn't careful, he could die in the blink of an eye!
That was the danger for Vicente's partner. But Vice and his group also ran the risk of losing track of the man and having no way to move forward.
Casey's ability was too phenomenal for Vicente to give up on this guy, so upon hearing this information, Vice became concerned about the continuity of his plans.