Although they had already advanced to become pre-heaven experts, due to the special nature of their unique skill "Seeing one's true nature clearly, the golden body of an arhat," the Four Great Secret Guards still couldn't use internal martial arts like the "Splitting Air Palm" to directly deal with Jia Zheng, who was two zhang away and surrounded by others! Fortunately, after becoming pre-heaven experts, abilities like "Lion's Roar" were no longer restricted!
However, because Eric had given the order beforehand to "subdue them first and resort to killing only if necessary," even though the Four Great Secret Guards were furious at Jia Zheng's insults to their master, they still held back a bit. They didn't use their full strength to deliver a lethal blow!