Comparing the speed of escape techniques is the most intuitive way to judge a cultivator's skill.
Cultivators with higher realms, deeper cultivation, and stronger Dao power will naturally fly faster than other trash. Not only can they kill their pursuers with a single sword strike, but they can even arrive before their target, setting up a net to await their doom before the opponent even finishes spitting out a mouthful of essence blood and lands.
That's why rogue cultivators, when adventuring in the wild, must be observant and cautious. If they see members of the Three Great Sects from afar, they should run. If they are foolish and don't know when to cut their losses, they might be caught by those old monsters from the Xuan Sect. A few punches and kicks, and you'll be subdued, with your earnings from ten days to half a month stripped clean, all under the guise of 'robbery, want to fight one-on-one if you disagree?'
If you encounter someone from the God Sect, they might even suck your blood, search your soul, and flay your skin, leaving you with only a wisp of Nascent Soul to escape and self-destruct. Alas, the world of cultivation back then was so harsh and cruel...
I've digressed. In any case, from Zheng Zetian's perspective, this Senior Brother has some skill. At least his mastery of escape techniques far, far, far surpasses his master Song Dayou.
Song Dayou's mount, the lightning cloud, was refined and collected by himself on Qingting Peak using a secret lightning Dao technique. It's a type of magical artifact that aids in escape. It's clear that due to his limited talent, he couldn't fully utilize high-grade lightning escape techniques, so he used talismans, auspicious clouds, and other external items to assist his flight. The speed