The final, and arguably most significant innovation, which might at last make American football uniquely "American", was the legalization of interference, or blocking, a tactic which was hugely illegal beneath the rugby-design and style principles. Interference continues to be strictly illegal in equally rugby codes. The prohibition of interference in the rugby recreation stems from the sport's strict enforcement of its offside rule, which prohibited any participant over the group with possession with the ball to loiter between the ball along with the intention. In the beginning, American gamers would obtain Inventive means of aiding the runner by pretending to site unintentionally knock into defenders attempting to tackle the runner.
The referee positions themselves to the passing arm side on the quarterback. In the majority of game titles, the referee is chargeable for spotting the football ahead of a Enjoy from scrimmage.