Ive ran the sword on hard, and won, over 125 times. The best, consistent, method ive found so far..... with no supers at all..... is (RB,RT,RT,RT,RT on Xbox) or (R1,R2,R2,R2,R2 on PS) If you down him 3 times on the first sword and do this, itll bring him a little before the "r" in "Crota". He will be dead on the first down of second sword. I know 5 RT/R2 does more damage, but it is very difficult to pull off, therefore inconsistent. I hope someone has a better combo because I would love to kill him faster lol