 This decision was controversial enough among Asian karatekas to force Oyama to put a challenge in a magazine, challenging any of them to a fight against Bluming in a boxing ring and promising to strip him from the black belt if the Dutchman lost.Oyama was so confident that he also promised a hefty bounty, and swearing to retire himself from the Kyokushin school.Only the Korean champion Kwan Mo Gun accepted the challenge, and was swiftly knocked out by Bluming via shotei.