Have you ever heard of a mountain chicken?

The concept of a race of beings called the 'Demons' does not exist to the current people of Aidos, so the restrictions should apply, just like it did when I tried telling Dad that the invaders are actually the 'Demon' race.

But for some reason, when I accidentally spoke about the demons, Richard heard my words loud and clear and I received no repercussions for breaking a restriction.'

That was the reason she had become suspicious of her brother and had been watching him closely. Arnold was just an extra target because he was very close to her brother, however, now she was 80% sure that Arnold was definitely in on something with Richard, something that made them aware of the 'Demon' race, a race that people didn't even know existed.