"I can only say that with an uncovered entrance, the nozzle should be as close to the interior of the fire scene as possible, constantly adjusting the angle to spray water diagonally against the ceiling. This is a method that can limit the amount of air entrained in the stream and quickly cool down the temperature."
"Moreover, the old pattern of one team covering while another attacks is not immutable. Just design a multifunctional water gun that can jet straight and spray at the same time. It can create a spray pattern, a direct jet, or be designed with a spray on the sides and a direct jet in the middle, allowing for self-cover and attack, enhancing mobility."
"Hmm..."
A multifunctional water gun with direct jet and spray, that's a good idea.
