Lex was lost in his thoughts, reaffirming his resolution as Fenrir ran through the wild. Maybe the decision he was making wasn't the morally correct one, but it was the best one for himself and his dependents.
His mindset was undergoing a subtle change as he contemplated the philosophy behind maturing, and if it counted as maturing if he didn't like the decisions he had to make. Or perhaps, that is what maturity was to begin with.
Alas, his dramatic internal monologue was interrupted by his intuition. He looked up but saw nothing due to the absolute darkness that had enveloped the sky, yet his eyes seemed to be fixed on a moving target.
While his eyes were dependent on light, his other senses were not. His spirit sense had a vague range of about 100 feet (30 meters), where sometimes it could go a little beyond and sometimes is just below. His intuition, however, had no clear limit for how close or far an object had to be before it could detect it.