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Nairobi family meets hero who saved them from Westgate mall

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It was one of the most powerful and moving moments captured on camera from the mall massacre in Nairobi: a young mother, playing dead with her two young children for several hours... until a stranger slides along the floor, convinces them he's one of the good guys, and rescues them.   Today, our cameras were there when the mom and the stranger ... who turns out to be a local police officer... met for the first time since that awful day.