From Pearney, Ivan learned quite a bit about Billerie.
Billerie was the only apprentice with 5th Class talent, genteel and diligent; he was simply a born winner in life.
Billerie had now turned into a wild beast, a madman with a drastically changed personality; he might have colluded with that thief.
Given Billerie's current situation, he was bound to stir up trouble and kill Toyennes to eliminate the source of the curse power.
Moreover, the castle was surrounded by a sorcery array that could interfere with the Secret Method Seal and also provide a certain level of protection for the castle; hence, it was safer inside the castle than outside.
She explained that she had walked into the trap herself merely to seek a way to suppress the curse and, additionally, did not want to be captured as an accomplice of Billerie.