"They" have tried to explain this video away as a time lapse with many hours between each fire so we don't know what we're talking about but that still doesn't explain them in my opinion!
Actually a time lapse explains it even better because looking at the speed of clouds changing - a time lapse can be just a couple of minutes between one and the other, so it makes it easier for one drone to travel the distance when setting the fire. No need to sync multiple drones.
"They" have tried to explain this video away as a time lapse with many hours between each fire so we don't know what we're talking about but that still doesn't explain them in my opinion!
Actually a time lapse explains it even better because looking at the speed of clouds changing - a time lapse can be just a couple of minutes between one and the other, so it makes it easier for one drone to travel the distance when setting the fire. No need to sync multiple drones.