In the ring, rules and regulations dominate to ensure fairness and control damage. On the street, there are no rules. At best, rules of combat are dictated by personal choice, and fairness is often nonexistent – one against five can happen on the street.
Any fighting should be avoided if possible and done only as a last resort. If you can – flee!
Street fighters use real weapons like knives, shivs, bottles, guns, etc. Many martial artists whether black belts, grandmasters, stunt men, etc. have never experienced a street fight. When they train, rubber knives and padded sticks are used, giving them no knowledge of what damage a real weapon can inflict and the mental and physical effect those injuries pose on performance and endurance.