So the risk assessment included historical data or research of the performance of a UAS after struck by fireworks that indicated it would crash straight down?
On that basis, no "first of type" or "first time this has been tried" would ever get off the ground, correct?
Or would you set up a firework display or a series of displays in the middle of nowhere and fly a UAV through the display hoping that it would get hit to determine how it would react?
How many times would you need to do this to get sufficient "historical data" and how many hits would you need to determine that the struck UAV would not do other than crash straight down?