“Light travels approximately 1 foot/nanosecond.”
I would think the speed of sound is more relevant than the speed of light.
OK, I will give you a few hints. “Butch” claims the implosion was complete at 2 nanoseconds. The cylinder is greater than 4 ft in diameter, so the implosion would be travelling at a speed greater than that of light. Water cannot travel faster than the speed of light. IMO that means “Butch” is a pompous idiot.
Also, I doubt very highly that anything in the human body, even nerve signals, happen in 4 nanoseconds.
If you change nanoseconds to milliseconds it makes a lot more sense!