You need 3, and you always have, so you and your brother did not 2 man it.
How do I know this? The first team that actually did 2 man it discovered the wall and had to go to orbit and bring a 3rd thru the maze and across the jumping puzzle before they left.
http://youtu.be/GSIggFG4KP8
40 minutes in. Watch for the next 4.
English
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Then why is it when you go in solo at the gorgon checkpoint you can push on in single player? The door should be closed. I do know what your talking about because we had the same opening/door closed to us before tho.
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You can't if you go in solo at the checkpoint. It isn't even a darkness zone.