Minato's speed does him well, Equius might be fast but his speed doesn't compare to his stamina and strength, so that hit to his waist connects. It jerks his back a little but he doesn't seem phased, shrugging his shoulders and rolling an arm before he moves to the side and sends a punch towards Minato's upper right shoulder. Boxing, yes? So he won't include any strong jumping or smashing, after all, he's not trying to kill this boy, just get their blood flowing.