I draqon has acted like this in my life, I realize how important is the social concensus of my persona and their judgement decision in how they treat me. So if a guy kicks me, I do not kick back when others see us. However in the dark alley when he is alone, is when I kick him. And the next day when he passes me, I smile back.
I did this many times actually. It started in kindergarden. A kid was picking on me playing with toy cars and laughing at me with other kids, than they shoveled me. I played innocent and cried a bit, did not touch him. Than when he saw how innocent I was incapable to do anything to him, he forgot his judgement and came to me alone when we were outside the school yard, he was telling me something, I took him by his collar and threw him on the grass with an evil smile on my face I said "do not pick on me again". He did tell his parents what I did and his teachers too, but they did not believe him. I played innocent the next day and only smiled at him oncemore with my white teeth at him. That was it for him
In middle school the incident such as this also occured in USA. I was silent in school and was not looking at girls, and an easy target for "you are gay" calls. Again I took it in, and did not hit back or say anything. When the two kids decided to pick on me when I was walking home alone, they soon learned that my true self was far different than in school, I picked up a rock and run straight at them and threw it. Next day their attitudes changed towards me, however I did nothing in class to reveal of what happened between us.
Lesson: turn the cheek when its done in front of others, than track the person down when he is alone and beat him up.