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Splinter Cell: Chaos Theory - disabling lights

Well, the right click (alt fire) on the suppressed pistol activates some magic device that can temporarily knock out a light - for about 10s or so. Why did I have to search on the internet and track down vague clues until I hit this page and found out for sure? Shouldn't there  be a manual somewhere? UPDATE: I gotta read the notes on the equipment screen more carefully...

UPDATE2: The manual is useful. Save trees/animal skins, don't print it out.
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