its grey because it can go unpunished. black and white is - they either enforce it or they dont. if there is doubt of when a rule is enforced it can be termed grey. im sure someone could push 4.1.2 and 4.6. until they were punished, but they dont know that limit, so its grey. if you false start in 100m youre DQ - that is black and white. no interpretation or subjectivity. i got to the context of the example in the end. i was just providing extra examples of greyness.