I need a citation I can point at. I'm pretty sure I've read this, but then again maybe it was in a dream ...
A is on their own 1 yard line. They run the ball, and get the ball completely out of the end zone, but when we turn the ball so that the long axis is parallel to the sideline the tail end of the ball breaks the plane of the goalline. That would be a safety, which was not the result of the play. So the correct mechanic is to move the ball forward a couple of inches to get it out of the end zone. In effect giving the offense a couple of inches they did not earn.
Similar situation. A is on their 1/2 yard line and false starts. Half the distance to the goalline puts the ball on the 9 inch line, which means 2 inches of the ball are in the end zone. We can't do that because that is a safety, so again we slide the ball forward to get it out of the end zone.
I know that I have read this somewhere, about spotting the ball outside of the end zone, but I can't find it. Who can tell me where it is?