if such thing as physical abuse is done (like a burn on the face or anywhere else because of such firecrackers, then it's an overwhelming evidence and if that happens to me or to anyone of my love one, I don't mind going home but they need to be reprimanded.

No harm, no foul. Same thing as on the road, unless you are hit (or bump) directly, "ALMOST" is nothing to THEM. But of course you can vent your ire but keep the window of the car close (and you can shout at the top of your voice, to release the anger).