I've got the Thorn Bounty also .. been trying to fill it for a while ... got all the way to 470 for the points needed (Twice) thinking "Next Crucible, your mine!!!"... Then both times had bad runs in the Crucible and lost the points .. back down to "0" now ... maybe I need some Guardians willing to commit suicide in the Crucible for me to get this bounty finally!!! ... LOL