After capturing the hostages, Jiang Fei passed these Japanese fellows over to old man Hai for interrogation. After all, the old man was much more skilled at it than Jiang Fei was.
Among the Japanese, those who were fighters or ninjas were rather tough to track. However, the technicians were easily intimidated and revealed everything they knew before they were even tortured.
Jiang Fei got to know about Tokyo's current situation from these Japanese fellows. He also found out about how the Mutants Brotherhood had suddenly grown a lot stronger. Jiang Fei and his two comrades, after some analysis, realized that the Mutants Brotherhood had decided not to cooperate with the China Martial Art Alliance and the European Vatican. They had planned to take over the Bio-Humans' technology on their own.