There's always a good hiding spot to be found. At the final boss in this weeks Mars Nightfall Strike, face the door that he comes through and to the left there is a ramp at his end that you can get underneath. Either slip down between the ramp and the left wall or jump the small crates at the side. None of the minions can get in (you can tell it pisses them off) and there are at least three vantage points to shoot from, albeit slim. You can get rockets and grenades out if your careful. Did it today with the whole fire team in there which helped in case of a bad rocket pull - looked funny at the time. Also did the weekly on L28 this way for a cool 9 coins. Good luck legends and hope this helps.