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Old 10-20-2009, 02:08 AM   #3
Medelus
 
Join Date: Sep 2007
Posts: 37

Medelus's Gamercard
You only stay in instant kill mode for about 10 seconds in-between kills. If you fail to get a kill in this period of time (it's hard to with this method -- the infinite spawn will ensure that you will never not have enemies flocking to you), you'll revert back to your regular fighting stance, and the kill counter on-screen will disappear and reset. So, you have to keep the chain going while not missing any of the QTEs to get the achievement.
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