The 'inflation' is probably caused by the detonator since the main charge would be a few milliseconds behind.

Totally feel like that after Thanksgiving.

I feel like that after a bowl of chili. Or prunes.

It could be a plastic flash bang 'grenade' for all we know. Or a grenade that uses loose shrapnel and a soft body. I guess the grenade we all think of as the basic grenade is the pineapple shape cast from iron or steel. It will crack like ice and will not appear to expand without breaking even in the very slowest motion because it is a very very hard metal.

>> ^zor:
It could be a plastic flash bang 'grenade' for all we know. Or a grenade that uses loose shrapnel and a soft body. I guess the grenade we all think of as the basic grenade is the pineapple shape cast from iron or steel. It will crack like ice and will not appear to expand without breaking even in the very slowest motion because it is a very very hard metal.

Right. The whole premise of those is to break at the seems sending hard metal square shrapnel in all directions.