Anyone got the Reflex Action Challenge? (Kill 10 Aliens using vents w/ shotgun)

#1Pokemon2000-0Posted 2/14/2013 1:25:43 AM
What level can I do this on?
#2Village IdiotPosted 2/14/2013 1:26:52 AM
Multiplayer

I donno if you can do it in single player, but if you can, then Haley's Hope is another one.
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#3Pokemon2000-0(Topic Creator)Posted 2/14/2013 1:47:54 AM
Which part of the level will they appear?
#4Pokemon2000-0(Topic Creator)Posted 2/14/2013 2:11:56 AM
*bump
#5neostahlPosted 2/14/2013 2:54:48 AM
I got this on the first lvl...
#6Pokemon2000-0(Topic Creator)Posted 2/14/2013 3:51:55 AM
Which part of the first level?
#7RufusNKenRSTierPosted 2/17/2013 8:38:51 PM
Yeah which part of the first level?
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#8XeroStrifePosted 2/17/2013 8:44:46 PM
After you free Keyes then most of the Xeno seem to come from vents scattered throughout the areas. Specially when you get to the part where you and O'Neal are going through the catwalks. You don't have to kill them as they come from the vent though. I got it fairly easily, I believe either as long as they came from a vent or are just outside the one they came from the kill will count.

If it proves difficult then you can always use a grenade launcher and hit them as they appear, then die and do it again from the checkpoint. Unless it says 'in one campaign mission'. I believe those challenges reset if you die.
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