Rab observed as Guilian went to work. The curse used was excellent, allowing the Muggle's pain to build gradually, letting the screams increase. He nodded as Guilian released the spell, hearing the darkness wanting him to keep going.
"Very good," he said, "You almost gave in, but you did not let it control you." He stepped back to him. "This is the hardest part, the first time you do this. It never seems like it will end. But trust me... it will submit to you."
He took another step back. "Now... continue. Use something a little stronger... just a little. Make the Muggle feel agony but don't overstep. Delight that you control his life."