The 'supplementary setting' mentioned by Gawain sounded like a fresh term to Amber and Philip, but the explanation of the meaning wasn't complicated. Gawain took just a few words for the duo to understand the meaning of the term.
"It also means that the castle is conducting a theatre show, and each individual in the castle is actually an 'actor' who doesn't know they are inside a show?" Sir Philip spoke of his understanding. "Normally, they are living in a hypnotized state, and due to the long-term spiritual interference, they don't realize anything is out of sorts in their daily life. But an outsider like us arrived and broke the 'logic' of the theatre show, making the plot no longer fitting to the facts and causing the show to be interrupted. Therefore, the mastermind of the show had no choice but to supplement his 'plot'?"