LAMB 2 SLAUGHTER: As an Infected, incap a Survivor who has entered and left a safe room.

Is there some special way you have to go about doing this? 'Cause I tried with a buddy and it didn't unlock. I followed the directions at xbox360achievements.org and did it at the end of the level rather than the beginning. I was on the Crash Course campaign, if that matters. Does it have to be done on non-DLC campaigns? Any help would be much appreciated. Thanks. :)

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Gaming Logo Designer - Only cowards hide behind Silver Memberships...

Here's how I got it.  It was on No Mercy first chapter.  As they made their way to the safe room all but 1 survivor made it to the safe room and shut the door, leaving 1 behind.  I was a hunter and pounced him.  I guess it was a while before they realized that someone was missing lol, and one guy opened the door and ran up the stairs to save him.  By the time he arrived, I had killed their teammate and immediatly pounced on the would be hero.  The others thought better and stayed in the safe room.  The second he was incapped, the cheevo popped up and he soon joined his friend.

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 JayceWhateley wrote:

Basically, never play the game with AI