Judgment
A few days passed as Rui did his best to gather all the information that he needed on his target smoothly. He had to admit, the musician was definitely a good idea. Having play pieces that hit all notes across audible and inaudible ranges conveniently allowed her to accelerate the process of figuring out her innate resonance frequency.
It wasn't long before he got the right combination of the triple frequency in the right layers to bypass the layers of the head to hit her brain.
As always, he chose to assassinate her when she herself was out and about fulfilling a commission.
The best time to strike his prey, was when his prey was about to strike its prey. Their minds were consumed by their target, making it less likely that they would detect threats to their own life.