I've done it twice. Once during this month's iron banner and the first time during last month's iron banner. The first time I did it was on the B flag of Firebase Delphi there were two titan bubbles and 4 gunslinger hunters. I ran in with my ahamkara helmet and a nova bomb. I died in the process, but annihilated the whole team as well. The 2nd time was the map where people like to snipe where the C spawn's heavy is(I can't remember the name of it). Anyway, I ran in to the C spawn with my Hawkmoon and snagged 4 kills before having to reload and I switched to my two to the morgue and put the last two enemies in their respective morgue.