Test out Yang's brainlessness

As Coco struggled to move her legs and Pyrrha tried to open her mouth in vain, Silvanus glanced at the brain frozen Yang. He wondered if she could still follow orders in this essentially brainless state.

"Yang," he said. "Twenty jumping jacks. Go!"

Yang began to do the exercise, her tits bouncing as her arms and legs moved. She didn't count aloud, though after twenty jumping jacks, she did stop and stand blank and brainless again. Meaning she probably couldn't speak unless Silvanus told her to.

And to test that...

"Yang, say, 'Silvanus owns my brain'," he grinned.

"Silvanus owns my brain," Yang replied in a voice that sounded somehow more mindless than she did even in trance.