I honestly don't see a problem with reducing the time limit. In the example you put that you'll only get around two people unless they're packed together. OK, let's look at any other super.
Warlock nova bomb: still only one or two kills unless they're packed.
Titan smash: still only one or two unless even tighter packed
You don't get many kills with any super, why should hunter be any different?
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I think the "panic" factor with the other classes supers can account for them getting more single kills. Plenty of times FoH or Void Bombed when its just me and the one person. Countless times supered while I have minimal health and it just take a couple shots from primary. If the "panic" was taken out of more peoples use of these classes supers they'd get more multi kills on its use.
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Because they HUNT that's why there hunters
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We don't get more than one or two kills unless everyone is close by each other. Your point isn't valid.