Comment: At a certain point the singer runs out of breath, so Cornelius changes the exercise, without even addressing the fact that the student ran out of breath. Her running out of breath had nothing to do with how she was breathing, but the imbalance of the registers. Once her voice was more efficiently balanced, she didn't run out of breath.
Quote: From what is now known of functional mechanics it is clear that the proper closing of the glottal space is caused by a correctly balanced registration. When the muscles drawing the cords into tension for the required pitch and intensity coordinate effectively, the end result finds the edges of the cords running parallel. No technique of breathing is capable of closing the glottal space properly unless the registers are well-balanced. (Voice: Psyche and Soma)