A 24-year-old Mixed Martial Arts fighter with Down syndrome, Garrett Holeve says he’s ready for a fight, but to him, his fiercest opponents aren’t in the ring: They’re the people stopping him from climbing into it.“I can (do it). Don’t mess with me,” Holeve told TODAY.com. “I’m a blue belt.”Holeve is backing up his fighting words with actions. Armed with a lawyer and the support