Pain. He had been in pain ever since he had been in that fight with Aponi. That stupid fight had left him alone with nothing but a pissed guard to lead him to the River borders. He didn't want to go and join alone. He wanted his sister back. He wanted to call her packmate too and that is why he stood to the borders of the pack she resided in and howled for her. @Adsila I need you. His howl was filled with the emotional pain he had built up since his father had died. Aponi's fight had been the trigger event to morph him into something scary. It was something that he did not what to be. It was a monster inside of him.
In the end everything collides. My childhood spat back out the monster that you see. His childhood had ruined him. It had started with his mother disappearing. Then his father died and things happened. The only true friends and family he had were his sister, whom he loved dearly as he was his sister's protector regardless of where they were, his uncle Lachesis and his auntie Pella. He was determined to reunite his family. He had come to collect Adsila from this pack and lead her to Cut Rock River. He needed them to be together for his family. Adsila was the only missing link. She was across the mountain and was out of the loop. He needed to take Adsila with him and he needed them both to join his aunt and uncles pack.
He needed it to happen.