I fell. I couldn’t get up. I hadn’t planned to write this post about injury, but then I got hurt. It was like jumping off a merry-go-round, like turning the sound off during the most dramatic part of a movie, like plunging to the bottom of a public pool on a busy summer day. The sights and sounds of the world collapsed around that single point of pain. The pain became a black hole, sucking everything else in. The jam was called. I was sprawled in the ref lane, unable to move. Per derby custom, skaters and refs took a knee. The medics converged on me. They started removing my skates and asking me questions, which I did not want to answer because…