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The commentators are correct that oxygen (liquid or otherwise) is not itself, technically, flammable. The common definition of burning is something, typically organic matter of some sort, combining with oxygen. Oxygen is fundamental to the process of burning, but there's always something else burning in the presence of the oxygen, and even though the oxygen is consumed in the process, we don't typically talk about oxygen itself "burning". Oxygen is technically known as an oxidizer, or to the forensics people as an accelerant. Adding oxygen to almost any fire HUGELY accelerates the rate of combustion, and liquid oxygen is the most concentrated form of oxygen you can have. Theodore Gray

The original video is better than this highly compressed post shows, especially for the 300fps examples. The flickering in the dolphin shot is due to fluorescent lights: The arena was lit with a combination of non-flickering spot lights and flickering fluorescent lights, so some areas are good, others are terrible. At 300 fps you get 5 frame per 1/60 second AC flicker. Some other shots I took at this aquarium at 600fps were completely unusable because all you see is wild flicker from totally black to fully lit in a stroboscopic effect. Yes, you need excellent light. Outdoors is good, for closeups I have three small super-bright LED video lights that work great. For dolphin arenas you take your chances unless you want to bring in a truckload of high intensity lights. But, the camera goes up the ISO 1600 so at 300 or 600 fps, f2.8 it's actually quite practical even indoors.