The bad thing was, while the victims trapped inside the barrier were powerless to attack, the people outside could easily attack the people inside and could also enter the barrier freely.
This is different from the usual barrier put up for the purpose of defense.
Usually, this kind of defensive barrier didn't allow others from outside to attack the people inside the barrier or enter the barrier.
On the contrary, the people inside could attack the people outside or leave the barrier anytime, and it wouldn't damage the barrier at all.
Why would someone set up this kind of one-sided reverse barrier? Of course, it was to trap beasts who unknowingly walked into this barrier.
But even setting up an anti-spirit one?
The Godfather believed this had something to do with people who were malicious towards him and Ainsley!
But for now, he didn't know which daring bastard dared to do this.