For what it's worth, I was told by game officials that the goal judge admitted he'd made a mistake and that he never saw the puck cross the line. You can take this with a grain of salt, but Peter Mannino, the DU goalie, also said the puck never crossed the line. Colby Genoway agreed with him. And the overhead video and other replay angles were inconclusive. If Shepherd didn't see the puck cross the line, there was no reason for him to overturn his ruling on the ice.