I did five at once with a fist of havoc in the IB on the Shores of Time (long time ago when I still had my Titan) and they were all huddled inside of a bubble at the C flag....one of my only epic moments in the Crucible. I did take a flag solo last night with one of my lvl 28 Hunters taking out 5 enemies before one of them got me with a grenade but not before capping it (used my primary Black Suros, rare POS shotty, grenade, throwing knife and melee). I think we've all had those epic moments but getting all 6 at once, now that is EPIC.