Works in a court of law, but in a game the action happens in fractions of a second. Reflexes, reactions, changes in orientation factor in. My point is, it makes it subjective enough for the refs to enforce it inconsistently.You can find intent by a player's actions. You don't have to read their mind. Prosecutors have to prove some kind of intent for every single crime. They can't read the defendant's mind but can figure it out from their actions.