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Never believe ANYTHING you see on TV, hear on the radio or read in a newspaper about anything that has anything to do with scuba, especially if it involves a death while diving.
Going shallow on Nitrox won't have any physiological affects at all.
It's easier for actors to say Nitrox Poisoning than Oxygen toxicity. OT may have them end up on a bloopers highlight reel.However, your instincts are good and you questioned all the right parts! While "underknowledged" is a good term, don't forget that the writers might think it sounds "more cool" to say "Nitrox Poisoning" than "Oxygen toxicity".
"Adjustments" on open-circuit come purely in the form of partial pressure changes due to depth ... the diver has no way, short of switching tanks, to "adjust" the mix they're breathing.
Unless you are using Nitrox 5%
(Agreed thats not exactly a common mix )