>>>This tells me that enforcement is at the discretion of the enforcer
>
>Isn't it always?
>
>It's like taking it with the referee on sporting events: you can argue all day, you'll just end up with a "technical" foul (pun intended).

Good point. But then, rules in games are pretty clear, are they not? You may not tackle someone by pulling on their face mask, for example. Or a hockey forward may not advance in front of the puck.