Online bad blood has spilled over into real life for two UFC veterans. Former Strikeforce champion Jake Shields posted a video to Twitter on Friday showing a physical altercation between him and four-fight UFC veteran Mike Jackson, which took place at the UFC Performance Institute in Las Vegas. Shields and Jackson have feuded over social media extensively on a variety of issues such as race, politics, and more. “Finally ran into the b**** Mike Jackson,” Shields wrote on Twitter. “He quickly discovered the difference between calling people Nazis in person vs on Twitter. This racist is lucky so many people...