This gang of robbers were extremely depressed. They had not expected to find themselves in such a situation. Players that had never really crossed blades with Gu Fei would never know just how terrifying it was to contend with him. Most people thought he was a Mage that had spells that could insta-kill targets, but that assessment alone would be an insult to Gu Fei.
Just take the current situation, as an example. He was a Mage that had run out of Mana, yet he was still able to throw the entire party into a chaotic mess. That was something nobody could replicate.