Learn something new everyday... A defensive safety on a conversion is the only possible way for a team to have a score of 1 in football. However, a defensive safety has not ever occurred in modern football.
So, if Oregon was kicking the extra point, and the snap went over the holder's head, the kicker ran backward to pick up the ball, but is chased backwards by defenders until he is tackled in his own end zone, that would be a defensive safety on a conversion.
So, if Oregon was kicking the extra point, and the snap went over the holder's head, the kicker ran backward to pick up the ball, but is chased backwards by defenders until he is tackled in his own end zone, that would be a defensive safety on a conversion.