The snap is a loose ball play that typically ends when a player gains possession or the ball becomes dead by rule. If a foul occurs before either of those things happen, the basic spot of enforcement is the previous spot.
Once a player gains control, a running play begins and continues until the player is downed, or the ball becomes loose again behind the line of scrimmage. If a foul occurs while the player is in possession, the basic spot for penalty enforcement is the end of the run.
If the player in possession crosses the line of scrimmage, there can not be another loose ball play, unless the player retreats back behind the line of scrimmage. The basic spot for any foul while the ball is in possession or is loose BEYOND the line of scrimmage is the end of the related run.
If the ball becomes loose behind the line of scrimmage after the runner has gained possession, it is a loose ball play, and continues to be a loose ball play until it becomes dead or is possessed.
If it becomes dead after being loose behind the line, all action from the snap to the dead ball is included in the loose ball play, and the basic spot is the previous spot.
If the ball is possessed beyond the line after becoming loose behind the line, everything that happened before the possession is part of the loose ball play. Everything that happens after possession is part of a running play.
I’m sure I left something out.
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