If someone is hitting you on purpose, use "I" to report it to Admins. Don't take matters into your own hands, as hard as it is not to sometimes. It sucks to get teamkilled or wounded on accident, but that doesn't mean you should take out your frustration by doing it intentionally, either. Your ban is probably only temporary if this is your first offense. There are very few rules in the mod, just gotta follow the few that do exist.
