Yang Bo's idea was closely tied to his current environment. Actively releasing a Skill right now carried the risk of detection, making his passive collection ability a much safer alternative.
However, he couldn't think of many immediate applications for this passive ability, so he only tested it briefly before returning to his experiments with the active attack capabilities of Sound Waves.
He had figured out the theoretical method for attacking through objects with Sound Waves, but testing progressed slowly. The process involved calculating attack distance and material density, and required him to snap the fingers of both hands simultaneously so the Sound Waves would intersect at a specific point to generate destructive power.
