RJJ stops him in the later rounds. Nunn's style would give him problems though and he'd make Roy look less than invincible. RJJ preferred to be the counter puncher, makes guys miss and punish them. Nunn with his size, reach, southpaw awkwardness could box with RJJ at range and force Roy to take a more aggressive role. This would of been a risky fight for Jones Jr. But for all of Nunn's strengths he had weaknesses as well. He could stay in range for too long, letting shorter guys get to him and against a puncher like Jones Jr that's just suicide. Eventually Roy will punish Nunn for his continued defensive lapses and stop Nunn.