Kurt Russell is a cocky truck driver, who drives through Chinatown with his friend and they witness a rival gang fight between two rival gangs in an alley way, until three strange martial artists show up and start beating both gangs. Kurt Russell and his friend leave Russell's truck and go to a local oriental eatery, and find out, that the three martial artists they witnessed fighting, kidnapped his friend's girlfriend for a oriental master who is very old and needs women with green eyes to become young again. Kim Katrall also stars as a reporter who helps Kurt Russell and his friend find his girlfriend. With the help of the wise eatery owner, they all break into the masters layer and try to rescue the girlfriend before its too late.
Answer: Because the battle between the Chang Sing and Wing Kong was between them and the truck.
Grumpy Scot