It hasn't been tried for real yet but in theory it goes like this:
Wait out both cinemas,Open the door in front of you, Kill guy to the left(optional), Destroy camera outside, Now there should be a keycard guy to your left, Hopefully he should pull a nade so kill him and get nade + keycard. Now throw the nade so it lands just behind the left turn between the two cameras to your left(both cameras will be destroyed by the nade). This could be tricky but someone made a vid of how to do it, Don't remember who though.
Anyways, Now pause and do rest like normal.