I haven't actually achieved it because i'm never lucky enough to have all 6 of a team standing in one spot long enough. However, it is theoretically possible. I.e. 6 mens go to grab B flag, one of which being a sunsinger with his super. You run aftershocks to increase the duration of lightning nade to 6 pulses. Throw said ubernade on B-flag, get 6 piece, lock rezzes and tries to think he's supersaiyan and then dies again to ubernade. 7th column achieved, 1 nade.