You don't really need to follow opposing players that far vertically since the lighting has a billion meter reach. Give or take.
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In vertical maps like Thieves den, its really easy to escape a stormcaller. Though i do now just how long a reach we do have.... its nothing compared to a Voidwalker, Gunslinger, or Sunbreaker.
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Except that, unlike the other supers you mentioned, you don't actually have to aim Stormtrance.
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You do have to aim, though its a cone effect and the perk that expands its chaining ability widens the starting cone.