From the moment that Brave Surge and his men had entered the forest, he had been moving within Young Master Han's expectations.
Using his fellow mercenaries as bait for Gu Fei to cast AOE spells on the enemies... This was but a small part of his entire scheme. While that gambit might work on the enemies for the first person that fell down, Brave Surge would begin to expect for Gu Fei to cast spells on a bunch of them whenever someone fell down. As a result, he would surely stop any melee job classes from getting near any man that fell down and would choose to have the ranged job classes finish off the target, instead.
It was when Brave Surge had made such a decision that he had thoroughly fallen for Young Master Han's scheme.