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Defeating the locked room on Library

When 343Gs leaves you in a dead end and locks the door behind you, normally a huge army of Flood leaps out of the air ducts and butters your muffin. However, once 343GS goes into the little speech he makes just before he locks the door you cam e in by, you have just enough time to dash between the air ducts and hide behind one of the pillars. If you remain completely still and don't make a sound, the Flood leave you alone. A few minutes later, some Sentinels will open the door and distract the Flood, and you can continue on your merry way without any damage or ammo used.
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