Cohen also became friendly with some of the Chinese exiles who had come to work on the Canadian Pacific Railways. He loved the camaraderie and the food, and in Saskatoon came to the aid of a Chinese restaurant owner who was being robbed. Cohen's training in the alleyways of London came in handy, and he knocked out the thief and tossed him out into the street. Such an act was unheard of at the time, as few white men ever came to the aid of the Chinese. The Chinese welcomed Cohen into their fold and eventually invited him to join the Tongmenghui, Sun Yat-sen's anti-Manchu organization. Cohen began to advocate for the Chinese.