Rui did not feel confident enough to fight the root without data on, both, active and passive patterns of the Root.
There was a difference between these kinds of patterns.
Passive patterns existed in all movements of all living beings. These were patterns between involuntary and subconscious movements, including twitches of muscles and tendons, minute shifts in weight, respiration, perspiration, heart rate, complexion, and a dozen other variables. By analyzing these, Rui could predict the movements that a certain person was going to make by building a predictive model based on these tells and cues.
These subconscious cues and tells were devoid of any conscious or voluntary intent and control. Not even the most intense body control that the best of diplomats and spies trained in could get rid of the micro-physiological phenomena that Rui could perceive thanks to his senses.