You complete the PvP element to both the Thorn and Bad Juju bounties in the same crubicle match. Ive been putting off doing the depleted hand cannon task because I was stressing out about not being able to do it cause im only average at PvP but I ended up getting the exotic bounty for the bad juju and when I got to the crubicle part for it I thought what the hell, either way I will get an exotic weapon. I also have read a lot of other threads in the forums about people saying that Bungie should remove the PvP element to the thorn bounty and that its making them hurt their team by doing it but it isn't that hard, I just stayed on control and played how I normally would (capping and protecting flags) and still completed it even though I had sweat pouring out of me cause I was freaking out lol but just stick to it and you WILL complete it.