You know, all this "if I was there" and "I would have" stuff is amusing/ego building/hardcore if you will, but if you were actually there, would you really have done it? Since you probably answered yes to that, think twice about the consequences. I believe that if you injure the person, they are able to take legal action against you. If they were a minor, as it sounds, their parents could have sued. If you would have killed the person, you would be in jail. I don't know much about city laws relating to this, but where I work (not Tempe), you have to be certified (through an educational course) in what they call "Non Violent Takedown" or something similar to that, as I don't recall the exact terminology. The people who are certified are allowed to tackle and physically apprehend people, because they have learned how to do it in a safe way (regardless of whether or not they did it that way). This may just be how it is at my job, or maybe there are laws about it, but as far as I know, if you injure someone, you can get in trouble if they bring it up in a legal setting.