I can see the drone somehow being hit by a fireworks missile, deflecting that missile, and the missile going who knows where? Back down into the crowd (or worse, the launch site)? If it stayed above the explosions, fine; within them, maybe. But fireworks on that scale are risky at best. Throwing a solid object like some of the larger drones into the middle of them just adds to the danger.
But I must say, even if never done again, that's a wonderful video, perhaps the first ever?