Time allowed between each kill is only a couple of seconds, so two enemies have to be right next to each other for this to work.
If the enemy team is separated: You've got no -blam!-ing chance.
If the enemy team is grouped up: You need teammates by your side OR power ammo to take them on.
If you bring teammates: They can steal your kills and ruin it for you.
If you grab power ammo: You'll get killed by a Super before you get the chance to use it.
[b]Changes Needed:[/b]
1) Increase time allowed between each kill.
2) Make it so that you don't need to get the final kill.
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If you use hunter: use the vortex grenade on the zones when enemies are taking them. Titan pulse grenade does well too. Grenade launcher and rl work also. Just make sure the enemies are grouped up, obviously lol. I had a little trouble getting this challenge as well. Cheers and good luck.