Hmm, new B2 SA strat...
well, firing as you go down the first T and destroying the first camera might be able to lure the guard to the stairs, you'd have 30 bullets right, so you could fire all the way to the stairs. I wonder if you could skip that little extra bit down the first hallway and have the sound reach him by standing a little ways down the T towrds the first camera.
If you do get him to the stairs, then I suppose it's reasonable to think you could lure him while getting the documents, this is very interesting.
I think henrick on an emulator could test this out pretty well, not that other people wouldn't help either.