Just when you thought it was safe to get back into the octagon… On Sunday, former UFC knockout artist Anthony Johnson dropped the latest hint that he might be prepared to jump back into active competition again. “Rumble” Johnson (22-6 MMA, 12-6 UFC) threw himself in at the deep end of the grappling pool on Sunday when he took on Australian submission superstar Craig Jones in the main event of Submission Underground 9 in Portland, Ore. The event streamed live on UFC Fight Pass. “Rumble” lost out to Jones by heel hook after 47 seconds, but his clear enjoyment of the occasion begged the question of whether the competitive fires still burned inside the 35-year-old slugger. Thankfully, Chael Sonnen was on hand to ask. “This was just fun for me, man,” Johnson told him.