Over the years defensive teams perfected the "pull and shoot" where 1 defender pulls a blocker out of the way so another defender can get a clear shot to rush and block the kick. The NFL made it a point of emphasis a few years ago to try to clamp down on it. It was also mentioned in this year's NCAA Preseason Guide and umpires were directed to be aware of it. You are right that it is rarely called and I do not know if that is a function of it not being tried that much anymore or of refs just missing it.
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