This is how I did it...I went in the vault with the gold then took everything, talked to Elijah, destroyed the turret generator, shut down safety protocols or the console on the other side of the door, opened the door (still holding everything you want along with the gold), walked out passed the bubble thing then walked immediately to the right to the door on top of the stairs. Elijah came over and turned on the forcefield and then I walked right up to the field as he was talking. He will deactivate the shield and you will pop on the other side unable to move for a few seconds and just walk away while Elijah dies!