Full Contact (Xia Dao Gao Fei)

After tough and capable Jeff rescues his wimpy friend Sam in an impressively victorious physical confrontation at the hands of Hung, one of the city's top crime lords, they are forced to flee for fear of retaliation from the gangster's wounded pride. Jeff, however, is forced to seek revenge when he discovers that one of his partners, possibly Sam, has been a turncoat all along.