I have caused a fire just by firing my 9mm. The muzzle blast ignited either the dry grass or excess powder on the ground in front of my bench. I was at Garland gun range in garland, TX. The rangemaster said that it happens all the time.
See my #23. My point is how could one not notice if it’s right by you? I’m speaking of long distance that would be difficult to know.
The muzzle flash out of large caliber rifles would be even worse. But unless you are a moron, which is what these libtard news reports on how these brush fires started, it shouldn’t/doesn’t happen.