B has responsibility for the end line (until the end line is no longer threatened). F and S have responsibility for the goal line (until the goal line is no longer threatened).
B moved up to the goal line as soon as it was obvious that the end line was no longer an issue. Unfortunately, he didn't make it there until after the ball had been driven back out of the end zone.
Tough call for S because he never actually sees the ball. F probably had the best view despite being on the other side of the field.
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