First and 10 for team A at team B's 12 yardline. Substitute B1 comes onto the field and replaced player B2 leaves the field via the back of the end zone.
A. No problem.
B. Illegal substitution, a live ball foul.
C. Illegal substitution, a dead ball foul.
A. No problem.
B. Illegal substitution, a live ball foul.
C. Illegal substitution, a dead ball foul.
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