It’s fast because it doesn’t burn - it detonates. There is a definite (and Quite Interesting) difference between deflagration and detonation. The short version is that “burning” happens slower than the speed of sound, and detonation happens faster than sound (which causes a proper shock wave). In the slow-mo shots, you can actually see the shock wave (that blurry bit that looks like heat shimmer) emanating from the cord as it detonates.
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