The drones are small fry. They're no worse than birds. These drones are small. Very small. Very fragile. Very light weight. These are not military style missile shooting drones but more on the scale of small model aircraft. This whole thing is over reaction.
The drone was 'in the air space' not in imminent collision, not collided.
The probability is the drone would not have been hit by the firefighter plane.
Had the drone been hit then the probability is the drone would be destroyed and the fire fighter plane would barely notice.
Had the firefighter plane noticed it would likely not have sustained any significant damage.
The drones are not a significant threat. Mow them down if they get in the way of the firefighting plane.
This whole thing is an over reaction.