Commission

Still, he couldn't help but be surprised that they had managed to pull it off so well. They had mastered the art of hiding in plain sight. This was what it meant to disguise, as opposed to conceal.

However, these measures weren't all they took. 

Rui quickly noticed something strange when they entered the building to find rows of people scribbling away on books.

No one exchanged a word with another.

Even the girl that led him in did not actually utter a word. They just seemed to stare at each other in silence.

'No...' Rui narrowed his eyes as he paid attention to their body. 'This is non-verbal communication. They're relying on subtle body movements and twitches to convey what they're saying.'

Had it not been for the fact that he had mastered Fauna Flow, he would not have been able to detect this in the first place. However, he was clearly able to see it thanks to his background in non-verbal communication and his senses.