This was the original perk back when the HoW exotics were data-mined. This is either the old perk remaining unintentionally or it was kept as a secret perk.
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It is an off screen perk that is only supposed to work with your melee's. It's like how night hawk still gives you increased accuracy when jumping even though it doesn't say so in it's perks.
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maybe but ill wait what bungie has to say