You need to trust your teammates 100% to down crota. Call out for them to fire rockets and as soon as you see a rocket enter you field of view, run towards Crota. If the timing is perfect you'll be able to do four strikes (and a super if you have it). After you've done all you can get the hell out of there. Use the slash attack while in the air to get away fast enough. If you're a hunter you'll be able to go invisible and do some more runs. Best way to get to Crota is to go to the left side where there are some rocks you can climb on and then jump onto his platform. If your timing is perfect you should be able to get 2 to 3 sword runs before the sword expires. Male sure your teammates are shooting the knights with the boomers in the towers whilst you're on the platform otherwise you'll probably die. [b][i]People say you have to be a hunter to do sword bearer but you really don't need to, it might just take one more sword runs to down him.[/i][/b]