He increased the power behind his action to see how far she would Myre would go to keep him on the outside. His 'noise' though, that he lowered until not even a Jedi healer could recognize it for what it really was.
This strategy was something he had only learned after he had chosen to follow the ways of the dark side. Most Jedi would have never believed that the trick to a successful mind theft was to not care if one even managed it. After all, those who do not care to stay alive are often those with the highest chances of a long life.
His face, scarred as it was behind his mask, began to show a wide grin. He hadn't had such fun since the emperor took him out of direct battle engagements.