Qin Xuan held a much higher status in the Qin Family than Qin Ken and his prowess in swordsmanship far surpassed Qin Ken's as well.
Qin Xuan had, of course, seen Tifeng's corpse, and he also noticed that two Golden Powerhouses had been killed with a single sword strike each.
This showed that Gao Xuan had a significant advantage in battle, which allowed him to easily slay the two Golden Powerhouses.
As for Tifeng and Qin Ken, Qin Xuan actually looked down on both of them a little.
Qin Ken was a despicable person, while Tifeng was stubborn and foolish. Neither could be called a true powerhouse.
Although Tifeng possessed the Eternal Spear, his own cultivation was insufficient, and he could not unleash the full might of the Eternal Spear.
Judging by Tifeng's state when he died, he hadn't even used the Eternal Spear.
Otherwise, how could Gao Xuan have been left unscathed?