When the old keeper forgot one latch, the 400-pound silverback reached through the steel

that summer, he began reaching for one man again and again.

Tom Barrett forgot the west corridor latch at 6:17 on a Tuesday morning.

It was the kind of mistake that would have meant nothing in a kitchen, a parking lot, or a grocery store. A man could pause in front of a cabinet and lose the shape of a familiar motion for a few seconds without anyone continue reading …