1. Heavy Ammo spawn spam during the crystal phase.What's your strat for taking down the swordbearer when doing the ledge strategy on Crota hm?
2. Gjallarhorn.
3. Everything.
Do 90% of the damage while well outside of Boomer/Crota range. Drop down and cross your fingers the team can finish him off. Firing while down there can draw Boomer and Crota aggro so when it's possible you want your team to kill him. If you have to shoot the Swordbear while down there then call for rockets as soon as you get near the rocks. Don't wait for cloak or anything or Crota may cut you down.
An armor piercing sniper rifle is also very helpful.