Did the Death Race in Grand Cache a few weeks ago (on a relay team).
One participant fell on her bear spray and punctured it. She got covered, as did a bunch of folks after her. It was crazy wet so it soaked her cloths and she had to run for about an hour to an aid station. She said it was like being on fire.
They couldn't let her in the medical tent as she was off gassing nastiness - so she had to be stripped in the parking lot and lubed up with dish detergent.
I don't think I'll ride with bear spray anymore.
I have no idea why anyone would think it necessary in an event like the death race- about a thousand people are on the trail with you - if you are the "one" chosen to be ate by the barr ... it is just your time.