well never really know for sure how shot his legs were because he got caught with that hook early, it seemed to me that early on sergio was feeling out cot to and got caught so we never got to see how fresh he was, but the word is that martinez got concussed from the blows and told sampson after the fight that his legs are fine,the only wrong was his concussion he suffered.So you can say the concussion could of caused the reaction for sure for the rest of the fight. Well never definitively know though for sure, but cottos strategy of pushing martinez straight to his right hands was working golden though!