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					Originally Posted by phansen
					
				 Casebook 5.3.3 discusses how the ball is placed after 4th down and a change in possession. From what I understand the ball is placed as it was prior to the 4th down play on a pass. On a run the foremost point of the ball now becomes the rear point of the ball for the new offensive team. The line-to-gain chains would move accordingly to the foremost point of the ball in the new direction. 
 Is this correct? Or am I missing something?
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 CANADIAN MECHANIC:
 
The LS is the tip of the ball closest to B's goalline, with the rest of the football is in A's backfield.  After a last-down incomplete pass, the Referee shall pivot the ball 180º around said football-tip, such that the LS doesn't change.  The rest of the football shall now be in B's backfield, which becomes the new team A because of the change of possession.