While at depth, the principal hazard of excess nitrogen pressure is nitrogen narcosis. But there is also an increased risk of oxygen toxicity. The oxygen pressure at 130 feet when diving with ordinary air would lead to oxygen toxicity if the diver stayed long enough. Because the recreational dive tables allow for only a short time at 130 feet, oxygen toxicity is not a problem. Since the first manifestation of oxygen toxicity can be seizures, diving with nitrox can lead to drowning.
Oxygen toxicity is the limiting factor when diving with nitrox.
Anyone diving with nitrox needs to be aware of this potential hazard. I, when diving to 100 fsw and 130 fsw. For several reasons the use of nitrox by recreational divers is controversial. The same quality control achievable in military, scientific and commercial applications was not always found in facilities promoting nitrox to the recreational diver. Compressed air for scuba diving is universally available because, basically, air is air.