Who the heck thought it was okay to dust the crowd with a cloud of some kind of fine powdery substance, especially in the presence of pyrotechnics onstage??? Surely no one who has ever been a fireman, or worked in a grain silo, etc.
There are runs where the people run through dust bombs thrown at them from the spectators. Doesn’t sound smart to be running (and sucking in lots of air) while people through colored dust at you.
Have to admit - I hadn’t thought of it catching on fire though - I always thought that was more of in a confined space like a silo. But probably wouldn’t have to be.