You lost to a Stormcaller whos super is specifically designed for short ranged AoE. You stated you ran into a stormcaller.
Your super is clearly at an advantage from a ranged position. Even if you are in close range, your melee should have been priority right? Correct me if I'm wrong but Sunbreaker super gives Titan melee a huge damage boost (one shot?).
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It's not a one shot while in stormtrance I believe. Definitely fast enough to do 2 before dying though.