The mark was too faint to be a fate mark, not to mention fate mark patterns weren't like this. As a genuine fate mark enthusiast and scriber, Gale knew this better than most people.
Essentially, a practitioner needs to get in contact with some supernatural element—naturally bourne elements, or fate locks, to be marked by fate. The mark was just a physical manifestation, as it leaves a mark on the body as well as on the spirit.
Through the mark, a practitioner's aura changes as some superpowers manifest within them.
"Do you mind if I check it closely?" Gale asked after some hesitation.
Xiaolin nodded, not understanding.
"It may be a bit uncomfortable for you," Gale said. "I have to touch there to pierce through with my Qi sense."
Xiaolin nodded, unable to meet his eyes.