With the PAT play not being a regular play, wouldn't the only score permitted be:
a) 0 points if the kick is not good
b) 0 points if 2-point conversion is not good
c) 1 point if kick is good
d) 2 points if 2-point conversion is good
e) the defending team would not be allowed to score, only stop a PAT
Until the ball is dead, I can partially understand the answer that a NE player could continue the play and score 2 points, however, with the PAT not being a regular play, the fumble and interception rules would not apply, thus stopping the PAT with an interception may be all that is needed to end the PAT?