Rules were made to be broken
Football coaches don't read the 267 pages of the NCAA Football Rules and Interpretations Book for what it says. They read it for what it doesn't say. Anything not in the rule book is an advantage waiting to be utilized. It has been ever thus.
The late David Nelson, who served on the NCAA Football Rules Committee from 1958 until his death in 1991, wrote in his history of college football rules, "Anatomy of a Game," "Many times the rules were changed because they were not taught or enforced in conformance with the spirit of the rules."