GLaDOS gave the nurse a flat look, clutching the edges of her tray stiffly.

"I was testing a theory," she repeated. "My theory was incorrect. If I am going to repeat those actions, I would do so under altered circumstances. I do not repeat anything unnecessarily."

She looked back at Crane, her eyes still emotionless but with a strange smile curling on her face.

"Unless the subject has proven themselves particularly durable."