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...
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Beyblade meets close combat
Let it rip
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.