The player can't do anything about the grenade mechanics. I'm not sure what's reportable.
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Yes, but this is a glitch that people are exploring. The glitch is the perk should activate on grenade kills but it's currently activating on grenade hits. Plus armour perks shouldn't stack, no other armour perks do but this one does.
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Yes, but the player has no control over this. How can this be the players fault? Ass move, yes. Player in violation of terms, no.
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They banned people over quitting during the loading screen, they'll ban people over this.
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No they won't. Just like they didn't ban over they Crota or Atheon/Templar glitches.