 After forcing three standing eight counts on Cypress in rounds two and three, he continued to batter his opponent in the fourth and caused his corner to throw in the towel.Having outgrown the domestic circuit, Bush won his first world championship in 1990 against #3 ISKA world title contender Emmanuel Essissima in Paris, France where he won a twelve-round split decision over the Cameroonian for the full contact ISKA light middleweight (-72.3 kg/159.4 lb) belt.Bush then became a world champion for the second time in 1990 with a fourth-round KO of #1 WKKO world middleweight contender Bubba "Blackhawk" Walters.