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Use the stun gun and frag greandes. As soon as you can move again after the cutscene, run (better sprint) towards Barrett and shoot him with the stun gun once you're close enough. Reload the gun while taking a few steps back, then throw a grenade at his feet. Do this stun'n'frag a total of three times (four times on Give Me Deus Ex) to kill Barrett quickly and easily. CrankyCrank 20:10, February 28, 2012 (UTC)

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