sitting on the edge

 At work I was sitting on the edge. It was a long way down but I wasn't worried. I felt I was protecting people. By being on the edge others wouldn't fall over. The Dean came to tell me that he was worried that I was on the edge. He tried to help out be filling my cup. But it was just surface help. I was the one that needed to be careful on the edge.

They were teaching other people to swim in a small tank.