I am sword bearer. We did it on normal with me as a warlock with fusion grenade with burn and he shot Crota with first half of a clip of his primary and two HoC rockets to get Crota down. I am sure we could get it without Ghorn, but my buddy is already burnt out of Destiny because he has been playing since release and still doesn't have one and is tired of the repetitiveness and crappy RNG drops. It has really worn him down, so he isn't really down to put a lot of practice in killing Crota on hard. :/
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I understand that. I got mine after 520 hours. You guys will both get yours soon. Do you both have truth? If so, go to the rock, drop the sword, have him shoot 3(that is what a truth mag can do) as you shoot 3, pick up the sword, and that should be more than enough to get him down. It is all up to your swordbearing skills from there. If you dont have truth, do the same thing but with 2 HoC shots each. That should do the trick. If he just doesn't want to do it, I am sorry and would happy to try it with you if you are on xbox one.