06/30/2012 07:43 pm ET

Jennifer Mahin, 17, Rescues Girl Hours After Becoming Lifeguard

Jennifer Mahin, 17, heard some telling words at her graduation from the California State lifeguard academy in Carlsbad Friday.

“You might save a life today,” she remembers an instructor saying.

At about 8:30 that night a group her friends and family walked on Oceanside’s north jetty near the harbor and saw some frantic teenagers asking them to call 911.

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