Wizard Joshua and the other law-defying wizards did not add a protection spell on themselves.
This was not because they didn't want to, but because using a spell in Master Bennett's castle was an insult to him. The countless teleportation circles in the golden castle alone could directly take down any law-defying wizard. Not to mention Master Bennett's assistant Wizard Frankenstein and Doff the Beamon.
You could just tell how powerful master Bennett was looking at how many powerful figures came for a visit.
Therefore, no one would risk and use a spell unless it was totally necessary.
"Warning, violence is forbidden in the Golden Castle!" The magic circle spirit sounded.
"Shut up Joshua, you stole my disciple's luck. I'll kill you!" A murderous gaze flashed in Wizard Durmond's eyes. He had lost himself.
"Teacher, don't attack!" Wizard Durmond's disciple quickly yelled.