Team X opts for the 2 point conversion. During the play, however, Team Y intercepts the pass and runs all the way downfield to score a touchdown. Would Team Y be awarded the 6 points?
Also, can the same be said for the extra point kick? What if the kick was blocked, and simultaneously intercepted, and ran downfield to score a touchdown? Would it count?
if the defending team recovers a fumble or intercepts and runs it back to the other end zone they get 2 points. if they block a kick and run it back, they also get 2 points, not 1. back before the nfl adopted the 2 point conversion, a team was still able to run in the extra point, but it would only be 1 point, not 2. of course no one ever did it because why should they?
The defensive team can’t score on an extra point or two-point conversion. An interception or a blocked kick can’t result in the defensive team getting a touchdown. It’s theoretically possible for the defensive team to make an interception, then drop the ball before it’s ruled dead, so the offensive team can pick it up and score, but highly unlikely.
Well, everybody’s right and wrong.
In pro football, you can’t return a fumble, interception, or blocked kick on any extra point attempt, whether it is for one or two.
In college football, you CAN return a fumble, interception, or blocked kick and earn two points for the defense.
In high school football, the defense can’t score on an extra point attempt.
BobT - interesting. I didn’t know about that in college rules. For the pros, this means that if a defensive player finds himself with the ball in this situation, and he has his wits about him, he will immediately hit the ground or run out of bounds. I wouldn’t be surprised if the pros coach players defending 2 point plays to deliberately bat passes to the ground rather than attempting to intercept them.
I once saw a (college, IIRC) game where an extra point was returned for two points. It can be done. I don’t believe it’s legal in the pros, though.
In the NFL on any extra point, the play is blown dead once the defense takes possession. The offense doesn’t get a shot at it again. Nor can the offense try to return a blocked kick.
In college football, it’s slightly different. If the defense intercepts a pass or recovers a fumble on a 2-point try, they can fumble it back to the offense who can then try to get 2 points on the play. If the defense intecepts a pass in the end zone on an extra point attempt and then runs back into the end zone, it’s 1 point for the offense.
Once again, you’re right and wrong.
In the NFL, maybe you can’t return an extra point attempt
But in the CFL you can.
Gosh darn CFL, always screwing things up! 
Not a direct answer to the question, but in the NFL, if you mess up a kick attempt and get the ball in with an improvised run or pass, you still only get 1 point. You have to be trying for 2 to get 2 - apparently the idea is that you should have a chance to recover from a mess-up, but shouldn’t get a bonus for it. In college or high school, you’d get 2 whether or not that was the plan.
There may be a better rule book, but according to the NFL’s Digest of Rules on its website, it states that on an extra point, the ball is dead once the defense blocks any extra point kick.
I don’t know what happens if there is a bad snap and you try to run or pass the ball. That could be worth only one point. However, many two-pointers are the result of fakes from the field goal formation. I don’t know how the officials would differentiate between a mistake and a planned fake.