#1 This is covered under 10-3-1d, The end of A's run is where he lost possession (50). The basic enforcement spot is the end of the run. A would put the ball in play from B's 45.
2# First, a block in the back is 10 yards. But the answer is the 30.
3# Missed feild goals are scrimmage kicks. If the kick ends in the field of play, the succeeding spot is the end of the play. If the kick goes into the end zone, it is a touchback. (NF) NCAA is previous spot I believe.
4# First of all, if you are seeing blocks in the back in the opposite side zone, you are watching the wrong area. This is the hardest thing a young official (some vets also) has to learn, looking away from the ball carrier. When the ball carrier is entering the opposite side zone, you should turn your attention to the area behind the U & BJ (five man). And yes you are correct, even if you see it it is a hard call to sell.
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