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younger, they don t pay attention. reporter: sammy yuen started teaching these self-defense classes at new york city s university settlement center after someone told his dad to go back to china. armed with years of martial arts training: the objective is to empower students and get home safely. be aware of threats before they happen and give yourself time to get away. reporter: mary yuen now carcarries that knowledge with r and gratitude for her young teacher. excellent, very good! reporter: what do you think of sammy? he s really wonderful. he s very dedicated. he doesn t mind if you punch him the wrong way. oh, my. harder. harder? reporter: sounds like you enjoy that a little bit. too much. reporter: defying hate with power and joy. elaine quijano, cbs news, new york. o donnell: got to stamp out the origins of that hate, too. we ll be right back.