Sesshomaru snarled at her, having lost his ability to speak with the change but he was still strong. The attacks she landed hurt and he could feel some of his bones breaking but he didn't let them slow him down. Instead he waited and when she punched at him again he bit down hard on her arm and hurled her to one side as hard as he could in hopes of crashing through whatever was in the way would hurt her.
Perhaps engaging her in a fight was ill advised but he couldn't take it back now. He had to keep fighting until he got a chance to run to tend to his wounds.