Your English is excellent. Good clarification on the use of words "fighter" "streetfighter" etc. In the U.S. a fight in the street can be the simple challenge, based on pride (which is still potentially dangerous, because someone can fall and hit his head on the ground, which has caused many deaths, for example) -- to what may be called violence, which is survival. In the latter, some people do not even call this 'fighting.' On Bruce Lee, we can see that in 'street fights' he would often play with opponents, and not cripple them for life.