I have taken down crota HM in 2 swords on countless occasions. I can honestly say that I'm in the #2swordcrew
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If youve got a really good group u can down crota 3 times each sword therefore killing him in 2 swords, i had a group once who done this 3 times in a row (all 3 characters), it was all down to the swordbearer, no supers or anything! Our sword bearer jumped up from where the swordbearer spawns so there was no time wasted before he started hitting him