The glint of mercurial eyes turning in her direction is all she gets to notice before she slams into him. Kaius is ready for this approach and he uses his bulk wisely, distributing weight and hanging on with tough resolve. It would be unfortunate to attack him over Denali for the sheer fact that she might get some of the blows, yet Aithne could not allow him to continue his grip, to choke the life out of her own wolf. The snarl of Astaroth is acute despite how her ears lay flat against her skull, despite the pounding of her heart in fury and the rush of blood in her eardrums.

One knock, he stands, two knocks, and he releases, stumbling back as Astaroth uses his massive size to throw him away and Aithne follows on his heels, all teeth and flashing eyes and wishing to gore him. Yet Kaius has now lost his hold of Denali and that seems to send him into a rabid frenzy, the very idea of it driving him past the point of madness, and he attempts to counter her moves with his own thrust. Aithne's claws dig deep into the earth as she shifts her weight to her forefront and uses her hips as a counterweight to push back. They are two unmovable forces for she was built for his, a tank in her own right, and his thrust does little in the way of dislodging her.

That disgusting maw of hers lunges forward and she fancies she can smell the putrid stench of his breath as he does so; in turn she drops her neck and coils her head away but his teeth catch some skin at the back of her jaw and she feels it rip and shred. The release of her own warm blood sends her into a sort of gladiator frenzy and she suddenly thrusts forward once more as she attempts to jerk her head up and to the side before he can pull away so that their skulls slam together and then her jaws snap at the edge of his jaw. She grabs a hold of it and her teeth puncture the thin flesh and all the way into the soft gums beneath as well as the flesh underside of his jaw. As she grabs hold, at an angle so that her head is cocked sideways and one side of her teeth grips the thin jaw line, she yanks it violently side to side, perhaps unhinging his jaw or simply causing severe pain in his jaw.
(also, if Fin disagrees with this fight style, I will edit :P)

Then he manages to shake her off, pushing away and she spreads her legs so that she can catch the ground and it pushes her back, the Empress of the swamps. It would it's blood today as the hot liquid spills down the side of her jaw and drip drops on the nasty dirt. Before she has time to regather herself Kaius is already charging at Astaroth. The male would defend the female with everything in him - Aithne knew that - and she would defend both with her last breath. She lunges forward now, one stride, two strides, and then she is at his haunches while he tries to go head on with Astaroth. Good. Let him be distracted as she attempts to once more thrust her huge body against his to knock him to the side and give Astaroth the advantage to grab his neck, to choke the life out of him as he tried for Denali, and her jaw snaps out hoping to grab his thick flanks and to tear it wide open, lay it to the bone.