Question

why firefighters have to held hose pipe very tightly during fire extinguishing

Answer 1

Because the water which is coming out from the pipe has a lot of pressure, which is the reason that the pipe can't be held in a loose manner. So, they have to be held tightly ..or else the pipe would be out of control..
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Answer 2

Ok...my friend...

Firefighters have to held close pipe very tightly during extinguishing fire Because there arrives the Newton's third law which states ''Every action has its equal and opposite reaction''

According to this, When water is released from pipe at a very high speed....A massive reaction occurs right on the opposite of the pipe...Which means on the direction of pipe which is hold tightly by the fireman...Since the Opposite force is so Much that they will fall down if they don't hold it tightly....☺

It is a selfmade ans. by me...Have a nice day