I really don't see what's so great about an extra jump. There are far more better and more useful exotics to use. Let alone more powerful.
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It's more of a novelty that allows hunters to jump to heights similar to the other classes. double jump with increased height provides the highest jump, so adding an extra jump to that allows you to jump around as high as warlocks or Titans. Really there aren't a lot of practical uses but it sure is fun.
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I guess