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 massive weakness with sunbreaker that nobody seems to mention is that they don't have great vision when in their super. I noticed a lot of sunbreakers just spamming hammers when they see red on the radar, aslong as you stay out of the blast radius you'll be gunning him down while he's wondering where all of his hammers went.