Run! It's what is embedded in Fahar's mind. He knew that finding the dark place that Hersha suggested was a good thing and at the very least, after following his instincts as well as trusting the lady that he was currently carrying - made him have a good choice. After knowing where everything will lead him to the way that he had entered, he already knew of the place
Everything about the situation describes how he couldn't give a second to rest. Every breath that he took was every step that he moves. No one was safe, no one can escape the darkness that once taken over his body and no one can immediately forgive what had been done. Fahar knew of that, he knew about the consequences of entering a secret place with a secret group that had been controlled by a count in their empire.