Two weeks after Jonathan Martin suddenly decided to retire, he explained why. Briefly.The former Dolphins, 49ers and Panthers offensive tackle tweeted this Monday morning:[vc_raw_html]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[/vc_raw_html]Eight minutes later, Martin posted this now-deleted tweet:Martin injured his back shortly before the start of training camp, and he was told he’d have to undergo surgery if he wanted to return to the field. Instead, the 25 year old opted to leave the game.”It’s a tough break,” Panthers coach Ron Rivera said when Carolina reported to camp late last month. “Anytime the doctor tells you that you might have to have surgery, it opens up eyes.”After erasing the above tweet, Martin, the central victim in the Dolphins’ 2013 bullying scandal, posted a reminder that his time in Miami wasn’t memorable.[vc_raw_html]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[/vc_raw_html]