the motion you make to slip a jab inside is the same motion you make to throw a right hand. so your right hand is actually a slipping motion and a punch all in one. thus, your right hand is already, naturally, a counter punch.
slip a jab inside, through the space next to your right ear and over your right shoulder, and, in the same motion, throw your right hand.
the trick is to slip and punch all in one motion.
but what happens to a lot of guys when they try to throw this counter is they get their arm stuck on the other guys arm.
when you get your arm stuck on the other guys arm heres what you do.
the trick is to slip and punch in two motions. you start your slipping motion when you see his jab extending, but instead of throwing your right hand in the same motion, you throw your right hand when you start to feel his jab retracting out of your slip space.
you dont throw your right hand when his jab is fully extended. you throw your right hand when you start to feel his jab retracting out of your slip space, because of the way his arm is retracting back to his body in a v shape, thus freeing up its path. therefore its better to throw an overhand right than a straight right in this context. it gives his jab more time to retract back to his body in a v shape than a straight right does, as it takes a more roundabout route to get from point a to point b than a straight right does.