The Rare Genius Ban

At first, Rila was dumbfounded due to the Beast that was beside Ban, the person whom she was tasked to protect. Anything that happens to Ban will become her responsibility, and with her deep respect to the Family Head, god knows how she will be able to face him if something happened to Ban.

Hence, she immediately made a decision to attack the Beast before it could harm Ban. 

However, she was forced to stop a while later as she saw something that she was not able to comprehend for a few seconds. 

He was actually aware of that Beast's presence and in fact, was even able to order it around? How could she not tremble in shock knowing that?

Yes, there were cases where Beasts are captured and sold to rich people for their entertainment, to try to tame them and sorts, but no matter what, the Beasts that were captured would still act aggressively no matter how they were tortured or treated nicely beforehand.