There has been a glitch with the swarm & skip grenades for hunters to where every little hit with them will provide super energy and not just kills just being touched by a piece of it. I was doing trials and two hunters had there super almost at the beginning due to those grenades.
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It's not a glitch if what the intent is what it's being used for. Even in the swarm grenade description it says it splits into smaller grenades and attacks enemies. So, yeah, it isn't a glitch.