Michael Bisping is 45 and hasn’t fought in more than six years, but an old rival may have stirred something loose in him. On his “ Believe You Me ” podcast with former UFC light heavyweight title challenger Anthony Smith, Bisping said he’d come out of retirement for a trilogy rubber match against Luke Rockhold . But perhaps understandably, there’s a pretty big stipulation: The fight has to be under the Karate Combat banner. This past Saturday in Dubai, Rockhold, who lost the UFC middleweight title to Bisping in a short-notice upset in 2016, knocked out longtime kickboxer and former Bellator fighter Joe Schilling in the Karate Combat 45 main event. It was Rockhold’s first combat sports win in years . Rockhold ended his lengthy MMA career on a three-fight skid