http://stream.publicbroadcasting.net/production/mp3/knau/local-knau-729165.mp3
When two medical helicopters collided low in the sky over Flagstaff nearly two weeks ago, seven people were killed; including pilots, paramedics, and flight nurses. For commentator Scott Thybony, it made clear a painful fact: it's easy to take emergency responders for granted, until you're the one who needs help.