[kellyhound]

The 52-year-old man was seriously injured.

[yah]

What kind of fireworks explodes like that from a relatively minor drop/impact? More importantly, why the fuck would someone handle it so carelessly (presuming that they knew how volatile it was)?

[Mr.NoCredit]

That’s nutty. Fully exploded on impact.

[kellyhound]

Originally Posted by yah ↗

What kind of fireworks explodes like that from a relatively minor drop/impact? More importantly, why the fuck would someone handle it so carelessly (presuming that they knew how volatile it was)?

Found some more info. Wasn't fireworks.
Kedarnath Siddappa Chhatre was loading a box outside the Sahara Gun House shop, that contained a sulfur-based material, loose gunpowder, and air gun cartridges/pellets into the trunk of his car when he dropped the box.

Sulfur lowers the ignition temperature of gunpowder and flash powders. When loose sulfur and chlorate- or nitrate-based gunpowders rub together violently during a fall, the internal friction creates instantaneous microscopic hot spots.

The box heavily contained heavy lead or metal air gun pellets and dense cartridges. When the box hit the ground, these heavy metal pellets acted like tiny hammers or anvils, mechanically crushing the loose, volatile powder beneath them.

Even inside a cardboard box, the instantaneous mechanical pinching of the powder generated enough heat to cross its activation energy threshold, causing a mass detonation rather than a slow burn.

Local police launched an investigation into the shop's compliance with safety and commercial storage protocols, as transporting loose, highly sensitive explosive components in bulk consumer packaging poses severe shock hazards.

[William May]

Wiley Coyote.