After completing the Lost sector in the rig, the "shortcut" door won't open. And sometimes, it will only open for one or 2 fireteam members. As seen in the video.
https://youtu.be/gJFvKxWzSNE
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LOL #SaveTheTitan
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Hello, That door is an exit that will only open when everything in the room on the other side on the is eliminated. Were you in the locked room when eliminating the enemies?