Tang Luo, realizing that the youngster needed time to process, didn't disturb him and continued to sit cross-legged in calm. The more he practiced martial arts, the more he realized its profound and vast depth.
His ability to shatter the spell's internal structure with a snap of his fingers was because his eyes could perceive the peculiar way the spiritual power fluctuations were progressing. This straightforward overlapping of the two marks could hardly escape his sight.
The reason the kid was having such a hard time accepting this was because people had grown accustomed to the idea that spells were invisible to the naked eye. Thus, seeing a spell shattered with a snap of his fingers was so shocking.