Been Lurking for years, but had to sign up to address this thread.
For many years I worked in the shut-down area as a part of my work as the "blower belt guy" for The Gates Rubber Co.
In about 1995 we were at Topeka. One of the shut-down worker's foot was caught in a parachute and he was violently thrown to he track, hitting his head. Apparently no one noticed that he had been seriously injured and was laying on the track - except for one other shut-down person. That worker raced to him and started performing CPR. That worker had extensive medical training and told us later that the worker was unresponsive when he got to him.
Since the Safety Safari folks did not see the accident, nor could they see the injured person and second worker on the track side of the barricade, they did not notify race control. They ran another set of cars while the two folks were on the track.
Several of us saw what was going on and raced to the wall to warn the two cars as they shut down.
I have tried to recall the worker's name but can't. He sustained serious brain damage. We saw him at the next couple of races at Topeka and after two years, he was really struggling with his speech and mobility.
When Pat and I saw the helmets at Phoenix, we were both very happy that, finally, something had been done to protect these hard working folks.
Jim