Howdy. For the 'Jolly Holliday' quest, step 7, you have to kill both shield brothers with shotguns. I took a fireteam in and we got me the last hit with a shotgun on them both, guaranteed, and I did it multiple times, yet I received credit for neither kill. Is there another step to this bounty I am missing, or is it perhaps just not unlocking? Also note I was using a green shotgun, so no shenanigans with Universal remote or anything like that. Thanks!