Can someone explain please?
Those Grenades usually do have a safety function. It Fuse gets activated at a certain distance from the shooter. They measure the distance by counting the Spins the grenade did...
There are tiny people inside controlling the grenade. If you spin it too fast they'll puke, effectively making it a dirty bomb
I've never actually seen the inside of a grenade IRL, so I'm going to have to go with what this guy's saying.
Beyblade meets close combat
Let it rip