Why in the movie,we see those who know KungFu can overpower and win over10 big size man in few minutes time?..?

is it fake one ? or those who know martial art really can protect themself againt any intruders and gangster|||"Kung Fu", in all its forms, can be very powerful, real and deadly.....However, in the movies. the focus is in story telling, and most Kung Fu move[monents] are choreographed....|||Ha ha, this this movie business where alien comes and we kill them too.|||..because movie is fiction.