Rei found it so weird how Nyiakole didn't like most of what her father did for/to her, yet she was still okay with obeying him. It was at this point, Rei confirms what he figured when he found out who Nyiakole was. He doesn't drink the tea and even sets it down as his bangs shadow and cover his eyes as he hunches over...
It's not a matter of business with me, Nyiakole. The way things are now, the world will be enveloped in corruption and fear. Your father is one of the sources, if not causes, of this threat. Billions will suffer just like you have, if not worse, Nyiakole. If you wish to remain loyal to your father, then fine...just understand that your father will fall...*stands and starts to walk to his room* and should you get in my way, you will too...Consider that a threat.