How about you watch me hit some lady in the face since she purposely walked into me on a train platform?
You are kidding me! Why would you want to hit her?
She should have looked where she was going
It was a mistake. You should let it go and move on, hitting someone is not a good answer.
It doesn't matter, I have to protect myself.
You have this violent streak and it should be abolished from your mind. Violence solves nothing, she probably just did it accidentally. You don't have to protect yourself from things like that.