Hillhick - I'm in your same situation. I too have Psoriatic Arthritis, since age 10, and though at a glance I may look like your average 6' 200lb man I am far from 100% physically fit. As others have mentioned SA is your best defense. Avoiding the bad situation is your best course but as we all understand each situation has it's own unique circumstances. Do your best to be prepared and to take the appropriate action/force needed to defend yourself.