Indeed, the A-class bodyguard from the Gold Sword Security Company was a martial artist at the mid-Mingjin stage.
After exchanging a few blows with an A-class bodyguard, Lin Yun was able to determine his martial arts realm.
Martial artists have distinct differences from ordinary people.
Ordinary people practicing martial techniques could face two or three others without issue. That's about the strength of the D-class security personnel and bodyguards from the Gold Sword Security Company.
With a little more strength and conditioning, fighting five or six ordinary people wouldn't be a problem either, equivalent to the capabilities of the C-class security personnel and bodyguards.
However, reaching the next level would be challenging for ordinary individuals.
Only martial artists, who had undergone bodily transformations, could accomplish this, with the exception of those with unique talents.