i always carry a knife on me so id have that but im not really sure if id even get involved it depends the exact situation and time of day, the least i would do is dial 911 and the most i would do is approach him and somehow not let him see i got a butterfly then stab him in an area that wont kill him before 911 got there.

hard to say wat ud do, u dont really think wen u got a surge of adrenaline pumping through u