While many un informed individuals in the human domain might envy the Psyquillian family bloodline, if they were aware of the plethora of steps and conditions required before accurately utilizing the bloodline to control an individual, many would think otherwise.
Everything, of course, depended on the level of mastery of the controller.
At Emeric's level, the first step that must be taken was to ensure that the individual the controller wanted to control had their guard lowered.
This, of course, could mean many things, but the simplest way to describe it would be: the targeted individual must not be on high alert; they must not expect that something was coming.
The continuation of the second step was heavily dependent on the completion of the first.
As long as the first step was completed, the second should have no problems. This second step was a question/statement triggered activation.