Keep in mind, stunts and skills CAN give you extra consequences for certain types. Sure, the boxer in question might have been given the hoojoo by his hoojoo woman before the fight and have used up his free moderate consequence (let's hope your opponent doesn't know about the "shaken up by wife" aspect that consequence gave you, he COULD invoke that), but he would definitely still have the free.
A professional boxer has most definitely taken the stunt "no pain no gain" and has an extra mild consequence that can be used on purely physical things. No matter how much hoojoo his hoojoo woman puts up on him, he is still gonna be able to throw down in a fight - unlike most people who could simply be too distracted to put up a real fracas.