Legally you are obligated
to do everything in your power to avoid a fight; to not participate in
the establishment of a future meeting place for a fight; to prove that
you had no opportunity to call the police; to use actions that are self-protective
and not retaliatory; to defend yourself only to the extent that is
justified by the attack; and to show that you did not go beyond what was
necessary for the defense of family, friends, property, or to prevent a
crime.
You are not required to leave the vicinity in which you are located to avoid difficulty although that is normally the smartest and most convenient thing to do.
When actually attacked, you may defend yourself with any tactics that are in line with the situation. If you participate in a fight, be sure the other person is in the wrong, and
any witnesses recognize that you had no responsibility for the situation
