12 did not have physics engine, therefore you would just bounce off your o-line, also rocket catching & nano blitzing was 'Gayer', in 12' you were able to face catch as well as long as your reciever 6'2-6'5, another thing you would be able to stack your people in the box in 12 but in 13 if you tried to stack your player would move back into his right position.
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