Side/rear Glass problems of the 2012 Honda CR-V

Upon leaving work, wife heard a wind noise coming from the sunroof, as if it was open. Upon sliding back the cover (slightly), she noticed the glass was shattered (with a big hole), and bulging outward or toward the interior. She was not around any other vehicles so it is unlikely the cause was a bouncing rock or pebble. Upon calling the dealership where the car was purchased, they referred us to a local auto glass shop. Upon calling Honda of America, they referred us to our insurance company. By the way, the car is still under full warranty. What can we do? it should be under warranty, shouldn't it?.