Diving - Did Gabe Swim Down and Save Tina?

Autopsy showed a small amount of water in tina's lungs. Could have been caused by her passing out with regulator still in mouth. But she had to be unconscious for this to occur. There was no explanation from the autopsy as to how she could have become unconscious. Police believed there was a real possibility that gabe turned her air supply off and then, when she passed out, turned it back on. Australian dive expert michael mac faddian disagrees. He said for gabe to turn tina's air off, he would have to hold her and twist her valve. It may have taken up to one minute to turn the valve off and for tina to breathe all the