deep kingdom

I have lives in the castle for so long and I've never been a guard. This is my first time and I don't know what im suppose to do. Lady everest told me I had to guard a certain mermaid. When I looked at him I immediately knew who he was. He was the arc aka the core to this castle. But something about him was weird... He was just sitting in a corner not doing anything just quiet.. I was nervous because I was a first timer.. but the first thing that came to mind was " Are you okay?"