Shadowsight’s heart lurched as paws pounded over the clearing. He turned as Tigerstar leaped past him and hurled himself, spitting, at Ashfur. “You tried to kill my son!” Rage turned the ShadowClan leader’s yowl into a hiss as he sent Ashfur tumbling across the clearing. He plunged after the impostor, hooking his claws deep into his flesh.
Ashfur’s eyes lost their glitter of shock and narrowed to slits. He twisted in  Tigerstar’s  grip,  pushing  up  with  powerful  hind  paws,  and  shook  the ShadowClan leader from his back. Eyes blazing with hate, he aimed a vicious blow at Tigerstar. The ShadowClan leader met his attack with a snarl, raising his  forepaws  to  slash  at  Ashfur’s  muzzle.  Ashfur  ducked  clear,  darting beneath Tigerstar and knocking his legs from under him.

Darkness Within, Chapter 2