Batgirl found his body language fascinating, especially the duality of it. She was no stranger to combatants with layered fighting styles, but people like Batman or Lady Shiva had artfully plended multiple conflicting disciplines and smoothed out the rough edges. This man's fighting style had no such refinement. He was almost all rough edges, draped by a blanket of martial arts discipline and serenity.
Unfortunately for him, it meant he couldn't disguise which movements were meant as feints and which had committed weight behind them. She didn't so much as flinch when he threw a fake right hook at her; the fist stopped an inch from her face. The solid left blow was easily dealt with by simply taking a diagonal step backward and to the right.
Once out of range, she extended the fingers of her right hand in a spear-finger motion, attempting to jab a nerve cluster under his extended left arm. If successful, he was going to find the mere act of breathing in difficult and painful.