Before any of you call my wife, let me explain....
Although my son did in fact reach speeds of 5-10 mph rolling downhill in a wheelchair he was never in any real danger. My daughter managed to catch him at the bottom almost every time!
Even if this idea for a picture didn't work out, I figured I might at least end up with a trip to a hospital emergency room.
Well, not just stationary, stationary and rotating.
What I meant was that I was standing in one place and following the subject as it raced past me. So I was turning my head to follow the action and that makes the blur even greater. As opposed to having the camera facing directly at the subject and moving the camera and the subject together at the same speed.