The man blocked her nerve strike with his arm, then retreated to a safe distance, obviously trying to come up with a different plan of attack.
Her fights with martial artists over the years have tended to follow a noticeable pattern. She would fight them and show off her skill, as well as her ability to learn fighting styles on the fly. They would retreat and devise a different tactic, as their usual ingrained techniques would only give her more ammunition. Almost invariably, they'd come at her with a more impulsive attack, assuming that if she understood specific fighting styles, she would be blindsided by something less structured.
The faceless man didn't disappoint. He rushed forward, grabbing and flinging gravel at her face. Cass had been eight years old in Hong Kong the first time someone had tried this on her; it had been more effective back then.
Batgirl sweeped aside the gravel with a swish of her cape; she used the motion to disguise her sidestepping motion. Once he'd rushed within arm's reach, she'd circled around behind him.