I've been trying this for hours yet run in two problems. 1) Crota moves right after I kill the first Swordbearer. I'm not taking forever in the Chamber or with killing the Swordbearer though 2) My Fusions don't take his shield down far enough. I've got double fusions with Touch of Flame yet still his shield is stronger than 8 grenades. Even if I hit him before with Thorn to keep him from regenerating, I'll run out of Super before he goes down.