Onewa stripped off his blindfold.  Strangely, he did not seem angry or upset about having to participate in the exercise.  "Sit down, Whenua," he said.
The Toa of Earth whirled to face him. "Taking orders from a Turaga is one thing, but from an overgrown hammer-swinger?"
For a moment , the two Toa's eyes were locked on each other.  Then Onewa's mask began to glow.  Whenua's eyes were glowing now as well, mirroring the look of the Mask of Power.  Whenua tried to take a step forward and found that his feet would not move. A second later, he sat down, hard on the floor, like a puppet whose strings had been cut.

Legends of Metru Nui, Greg Farshtey, p73 - 74