The abilities of the I SEE YOU trait had not been fully utilized by Raph in his past or present life, so how did he become proficient in using it now? Well, that would be constant practice and visualization.
Traits are abilities possessed by their Family that are greatly dependent on their visualization. It didn't matter how they decided to use it, but the proficiency in getting it to do what they had visualized.
His first ability enabled him to see through people, and their aura or circle pathways, as well as Ki pathways, were energy flows. The second ability enabled him to seize control over a person depending on the difference in their abilities, the third ability enabled him to summon ghastly illusions and the fourth ability enabled him to control a person's action for a period of time depending on the difference in their abilities.
