Posting here because no one is talking about it and Bungie has never mentioned it. If you shoot the GPG grenade, causing it to immediately detonate, the kills from that detonation do not interact with grenade perks like facet of mending. If you let the GPG grenade explode on its own, then final blows WILL trigger facet of mending. This bug has been around since Renegades released, but prior to that I 100% guarantee that manually triggered explosions interacted with Final Blow perks like mending and Firepower. I would just love to hear this be acknowledged by Bungie that this is indeed a bug that can one day be fixed. [spoiler]Moderator edit: This thread has been moved to the #Help forum where you can find answers and troubleshoot any Destiny in-game/bungie.net/companion app issues, courtesy of other helpful players and Mentors. Feel free to private message the moderator who moved your post, link to topic, for further clarification about why this topic was moved.[/spoiler]