Something you don’t necessarily realize unless you’ve held a firehouse is that there is an awful lot of force pushing backward when they open up the hose.
Like you know how a garden hose will flail around if you drop it while it’s on? Firehouses do the same thing but cranked up to 11. The guys might not actually have intended to fall backward but may have had to to maintain control over the hose and direct the water upwards.
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