81 can come onto the field and participate after the ball is blown ready for play and the other 10 players are in a set position. All 81 has to do is to be one his side of the neutral zone in a legal position (legally on the LOS or legally in the backfield), within 15 yards of the ball at some point, and has been set for at least 1 second. That last one is the hardest one for him as the ball may be snapped before had can get that done.
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