I will say that in a way one must know how to protect one self from being atack ,but in a real situacion is different when you are being atack and the person is moving as well it takes many years of training every day at least 2 hours and very intense training not something that you go once a week and go home and watch tv you got to think about it every day do it with different people of many sizes and weight speacialy if you try to go to a protest ,one must be organise and dicipline be straight in your head when you are there , like don't be stone or hang over from the night before be fit and work out every day like I said before.
I know this Iam doing it , so I should know is not easy to fight some one when he is after you.