The grenade perk was suppose to work like that though, they just didnt know how good it would be when stacked and used with that specific grenade.
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No, it wasnt working right. The perk was only supposed to increase super energy per grenade KILL. With the swarm grenade, the game thought that every little piece of the grenade was a grenade on and off itself, and that each one was getting that killing blow. Pnly one piece was supposed to proc the effect, not all 12.