Pre-102, the counter window was instantaneous. The 102 patch added a 6-frame delay to counter animations. This meant that if you blocked a punch, you couldn't instantly launch a KO hook. You had to reset your feet.
Short-term stamina loss for throwing high volumes of punches was increased to punish "button-mashing". fight night champion 102 patch
The fight starts. Marcus is confident now. He circles, throws a lead hook. Pre-102, the counter window was instantaneous