He means that the mines don't explode as soon as they're hit with the grenade. It just sits there spinning behind them until it explodes.
I've noticed that in AO, on the screen above the one that leads to the Stockyards (with the sleeping Slig) there's some mines. I throw a grenade in there, and after it explodes along with a mine, there's another grenade there.
And it keeps on going 'til all the mines are gone.
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