Its called teamwork and team shooting. Yes they have a damage reduction but 2-3 people making a stand can team shoot a sunbreaker pretty quickly same as they would a blade dancer or stormcaller. Run when on your own, running when have 2-3 guys vs 1 is what's getting you all killed. Edit: Nova bomb kills them, 2xGG or 1xGG without Armor buff kills them. Instead of running utilise what you have and if it means YOU die in process so what? You've stopped more deaths for your team by standing your ground and outputting as high damage as possible and got a kill/trade