(This is a partial repost because readers couldn’t figure out how to get to the second page of my posts. It’s not your fault, it’s mine.)
In-game lore describes the Thorn hand cannon as a corrupted weapon, a “Weapon of Sorrow”, which probably explains the kind of behaviors I had to engage in so I could complete the bounty. To complete the bounty, you need to get 500 points by killing other players in PvP with Void damage: 5 points for a kill, -2 points for a death. Unlike some of the other PvP bounties in the game, you get nothing for assists.
So because of this, whenever my teammate and I are both shooting at an enemy and I only get the assist instead of the kill, instead of thinking “Good teamwork, there”, I think “You just stole my kill, asshole. I hope we’re on different teams next time so I can shoot you in the face.” That probably isn’t healthy. And I’ve found myself abandoning teammates to die in a firefight because I thought they were so incompetent that they would get me killed too and I would lose progress in the bounty. Again, not healthy. I committed the ultimate sin twice, too: one time my team was doing so poorly that I figured I’d losing too much progress if I stayed. I also left the final match as soon as I finally got the 500 points needed to progress the bounty.
The mechanics of this bounty mean that you either go completely lone wolf, or you use your teammates as meat shields to soften up the enemies and you clean up afterwards. There were multiple times when I deliberately hung back in a firefight, letting my teammates die, and then leaping out and killing the enemies when they were weakened afterwards.
So if you have a teammate who’s being an ass, maybe he was corrupted by the last of the Weapons of Sorrow. Or he’s just an ass. Who knows?