Athlete knew fleeing was ill-advised but did so anyway.

Almost a week after the fright of his life, University of Alaska Anchorage cross-country runner Auston Ellis can't remember whether he heard the grizzly bear woof or a roar.

What he does remember very clearly is looking over his shoulder and seeing a huge set of jaws closing on his rump as he paused near the top of the Spencer Loop Trail on the Anchorage Hillside.

Instinctively, "I sucked in my butt." The jaws, he said, clapped shut with a snap, barely missing flesh. And then he ran.

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