Natasha hunched, ready for attack or evasion, as the woman stood, wand in hand, ready to hex. Her eyes were alight with the challenge, though she couldn't deny that the stinging at her tail was...bothersome. She was determined that she wouldn't let it distract her however.
Her breath heavy, the woman lifted her wand, and as she did Natasha jumped, the spell just grazing her as she closed her jaws around the woman's shoulder, crushing it in one bite.
What happened then, however, took Natasha completely by surprise. Instead of just falling down, the woman had steadied herself, probably magically, and threw herself in the other direction, throwing Natasha out of balance. It was enough for her to lose her grip on the woman and she growled and snarled in anger. The fact that she could see Fenrir watching them, did not make her any happier.
The woman was watching her intently, in spite of her left shoulder being crushed. Still she didn't let her guard down, at least not at first, but then she glanced over at Fenrir and Natasha took her chance to attack - only to hit thin air as the woman suddenly vanished into no where, leaving Natasha howling with anger and frustration.