Minor assault and fistfights are acceptable, assuming that both players have a reasonable justification as to why the fight started. Assault without any provocation or warning is strictly disallowed under a majority of circumstances. I've heard tell that three punches is a pretty good limit. In this situation lets say they get your id off, you punch em in the face once or twice and then shove them over. Snag your card and run off. It's not rocket science man. Don't beat people into crit unless they are trying to murder you. Don't use objects to beat people more than once or twice or at all for that matter.