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That view suggests a certain amount of cynicism WRT the motives of the officials, and I’m not saying that it is unwarranted, but the tendency on the part of the less seasoned members of the secondary to thoughtlessly run the moment the ball hits their fingers has caused many four-and-outs or worse at the goal line.
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Maybe not cynicism on motives so much as cynicism on the minutia of the game. We’ve all seen plenty of goal line catches right at the line called one way or the other based on an inch or so of ball position. Given the crowd on both sides of the catch there probably isn’t a replay that gives a definitive view (I certainly haven’t seen one) so if he kneels the play probably stands as a pick in the endzone and a touchback. But there is an old maxim of don’t give the refs a chance to see things differently. Once he got past the goal line which side he caught it on stopped mattering.