Asbestos doesn't burn(it's the biggest reason of why it was used everywhere) but the falling asbestos will break and create dust/particles that will propagates in the air and will go further and faster due to hot air being lighter thus creating updraft.

It's a french news but in Rouen an empty appartement building full of asbestos burnt to the ground some days ago but due to the Hamas attack on Israel no news outlets talks about it anymore.