Use a Warlock or Hunter and blink jump to escape the crystal chamber shield. Kill the first sword bearer before your fire team exits the chamber and a second sword bearer will spawn allowing your team to attack Crota with TWO SWORDS. You can also just use this technique to one down Crota before your team exits the main building.
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Doesnt the sword despawn after a certain amount of time once the sword bearers dead? By the time your teams gets everything killed and gets out there is the sword ready to despawn? What would be cool is if you had a team of warlocks and everyone blinked out killed him and immediately took down crota.