Yukari never got Nyton's message. As if it was never sent. Nyton, on his end, did what he thought he had to do to send a telepathic message. As far as Nyton should know, the message was sent, and Yukari isn't answering.
Anything Nyton said on loudspeakers seems to have come out right.
OoC unveil: Rather than attacking their minds, Melisson is altering the electrical impulses in their brains.
Sensory stimulus provides electrical impulses which are then carried to the brain, and human conscious thought bases itself upon these inputs to then either act or react. Acting or impulsive reaction in turn send electric signals through nerve endings to accomplish the intended actions.
However, put into the equation a being which may be able to visualize your neural map along with the power to manipulate electrical nervus impulses and Melisson pretty much lives up to Yukari's perception of her as a puppeteer on a level that goes a far cry beyond Domination as Amaya or Eve could perform.
Are you really perceiving things as they are? Have you really moved the way you intended to? When you speak to someone, are you really speaking to that person, or did you just intend to do so and Melisson allowed you to believe you spoke when you actually haven't?
...
Note that I am telling you OoCly to be fair and help you properly roleplay your characters, but your characters themselves are unaware of the specifics.