Slow Motion of Grenade Exploding - Real or not?

[Whiskey_Dickens]

@Ignotus

I must say, I have seen plenty of shards from exploded grenades, in museums and private collections, and while they may sometimes be twisted and bent, I have never seen an example of the metal being stretched, as the video implies. Heck, even the letters on the shells are sometimes left, perfectly readable!

This makes it hard to believe that the average grenade does the inflating-trick the video demonstrates. It’s not possible the casing shards would spring back to their original size, would they?

Does anyone have a reference or a cite for expandy-grenade?