Second and 20 for team A from team B's 32 yardline. B1 is flagged for roughing the passer. A2 catches the pass, runs to team B's four yardline and fumbles. The ball strikes the goalline pylon.
Is the penalty enforced from the B4 (EOR) or does the touching of the pylon by the ball cause a change of possession on the play for a touchback making the enforcement spot the previous spot