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BOSTON - Sydney Corcoran was standing near the Boston Marathon finish line when the first bomb exploded, blasting her backward. She tried to run through the billowing smoke and falling glass, but couldn't. Then she fell to the ground.

Her next memory is staring up at a man she'd never seen before.

"You're gonna be OK, buddy. Just stay with me, buddy," he said.

Read the full story at NBCNews.com.

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