When a sunbreaker is in his/her super u have the ability to suppress the super if u are a defender Titan or a night stalker Hunter. For suppressing the super use the suppress grenade on the defender Titan and then for the Hunter shoot beside the sunbreaker
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A well-placed Golden Gun shot will kill a full-shield Sunbreaker. It has happened to me multiple times. Running away when you hear the hammer pop helps too, but unfortunately everybody wants to be Rambo and goes after him to try and shut him down. Played IB the other day and my whole team ran away when we heard the hammer pop, and not only did none of us get killed, but we also won the match. Tactics matter, use your head and you can counter the hammer.