Dustin's legs move on instinct, practically dragging his feet underneath him as he shuffles along. But in spite of the fact that his body is trying to cooperate, Dustin continues to be agitated. Keith isn't understanding him.

"No, not--" He shakes his head once, pauses to let his inner ears sort themselves out. "--Questions. Tests. Make them explain everything. Don't tell them what they don't need to know."

There's a brief flash across his eyes as he remembers all of the tests he went through, as a child - before he learned about the intent behind them. But the memories are growing fainter again as the Element drains from his brain, leaving behind just flickers of images and the strong feeling of betrayal. That's a powerful enough motivator on its own.