Aware (know what's going on around you [Do they have weapons? How many are there? What are their intentions? What do you really know of the situation?]).
Avoid (If you can avoid the situation, then use your brain and GTFO).
Act (With no other option, take action. Be quick and precise and use only what's necessary to stop the attack).
Away (Again... GTFO! After you've removed yourself from the situation, immediately go report it to the authorities and say you don't know if you want to press charges yet [you tend not to think clearly hyped on adrenaline]).