Instinctively.

Clothes torn in every direction, blood dripping from every open wound that was taking longer time to heal, and the cruel instincts to massacre the opponent in front, they clashed again for the umpteenth time. He fought like a strong man, and it was taking everything, even in that heightened state of hers to evade most of his quick attacks that seem to be getting stronger and faster by the moment. His movements were almost too fast for her eyes to see, and that was what had led to so many injuries covering up her body. 

His outstretched claws from his nails and legs were black, and the small cuts she had rained back on him were also taking their time to heal. He looked so murderous, uttering another low groan from his throat. His long dark hair was covering most of his face now, and it looked as if he wasn't even breathing with the way he just stood still staring back at her.