How do I obtain 'Protected Leon and Helena' medal?

#1sidebeardPosted 1/12/2013 3:37:45 PM
What part of Ada 5 does this medal relate to? I've read different suggestions about it being during the zombie/chopper segment, the D-rex fight, the bit where Derek is pursuing Leon/Helena up the side of the skyscraper.

Can anyone say definitively what the requirement is?
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