I've seen this - twice - once when I was a little kid, my granddad used to blow our brake drums of all that nasty chalky dust, assigned that crappy job to me at about age 5, and when I started hacking up a lung waaaaaay back then, he tied a damp bandana around my face and said "this will help". Mind you, he died of Meso when he was 70, and I (at 61) have lung issues... The second time was working some ROP "youth employer" scam in high school restoring houses (at least I learned lath and plaster - cool skill I still use!), and one rather cute (and probably dead) stud duck of all of 18 was cutting sheets of asbestos to put behind kitchen backsplashes and gas fired heater rebuilds - ... with a sidewinder saw... dust effing EVERYWHERE and his "respiratory protection" was (diggit) a wet bandana around his mouth and nose...
Did I mention I knew parents of friends when I was a kid who smoked KENT cigs with their patented Micronite filters, which were ******* pure asbestos, and are all now dead as doornails from that... Should have smoked them using pure beryllium cig holders....
At least I know if I get caught in a fire, my lungs won't burn from all the damned asbestos dust over the years..... there ARE times asbestos is a great thing, but by God you gotta be careful with it!!