Yeah it’s pretty cool! Star Trek had been a bit of a directors boot camp for a while, I know several members from TNG, DS9, and Voyager went on into directing.

https://youtu.be/HDJsDJ-DD98

This is from the finale, but I don’t think it’s the firework scene

Didn’t the caretaker want the array destroyed after his death so the kazon couldn’t get it and its tech, I believe voyager was worried about the kazon disabling any bomb they left behind.