Its getting fixed next patch. It was an exotic perk that prolonged the super. Its a bug.
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yes, this time it was actually a bug XD. The perk was supposed to give back a portion of your super after getting a kill and going into invisible mode. However, the bug was that after getting one kill, a hunter could infinitely spam uppercut and restore super energy without killing anyone else. There is a limit though. The hunter cannot use that bug after spawning 5 orbs.