Tyson probably suffered a lumbago in the ring. I suffered one last WE and believe me it hurts like hell even if it's harmless. It feels like you just broke your back and it's really hard to move at all, let alone fight. That's probably what Mike meant when he said that. A real shame with Lyakhovich, he was actually one of the more skilled fighters now in this poor HW division and could have stayed among the top ten if he took this **** seriously but oh well...
