2 pt. conv.. Defensive face mask penalty occurs on the 15 yard personal foul. Where do you spot the ball?

Conversion fails. The foul occurred on the 15 yd. line. Where should the ball be spotted?2 pt. conv.. Defensive face mask penalty occurs on the 15 yard personal foul. Where do you spot the ball?
It's half the distance to the goal line from the previous spot and replay the try.2 pt. conv.. Defensive face mask penalty occurs on the 15 yard personal foul. Where do you spot the ball?
Assume its an NFL game. So the quarterback was busy getting stuffed all the way to the 15 yard line when the infrindgement occured or there was an offensive penalty prior to that play which took them to 12-yard line, in Mike Tomlinesque way, the coach decides to persue the play. The next play the QB gets sacked at the 15 and a face mask penalty occurs on the defence. The penalty is assessed from the previous spot were the play started, verdict is half a distance to goal. The ball gets spotted at the 6 yard line. Ok let me try to predict the score and time at this juncture, last 45 seconds on the clock and the score is 13-15 to the defence at that point and the offense is trying to take the game to overtime. The D's going to stuff the O again........
Half the distance to the goal line. So it starts off at the 2 yard line after the penalty the ball would be placed at the 1.
Probably half the distance to the goal line. If the play originated on the 15 the refs would place the ball on the 7 yard line.





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On the one yard line. The penalty is replay of the down and half the distance to the goal.
At the 1 yard line. It does not matter where the spot of the foul was.
Half the distance to the goal.
why is the two pt conversion on the 15 yd line??