If “will” is cohesion, whether on a physical level or on an abstract level or some combination thereof, then it becomes ok to say “the water tension forms and remains because the water wants to stay together”.
How water’s will to form this domain functions then becomes a study of will and environment. The “How wet is THIS water?” wettability index then becomes its fear of engaging with the environment, measured by its contact angle with the environment.
Soap convinces water to relax and be less afraid, lowing its contact angle with the environment, increasing its wettability index, which allows water to be more wet and engage with the environment.
So firefighters add soap to the water being pushed through a firehose so that the water isn’t afraid to make the walls wet. The wetter the stuff that makes up the walls are, the more likely the stuff that makes up the walls will decide it doesn’t want to be a wall anymore and would rather be wet with the water. This makes a hole in the wall and lets the other water go through to fight the fire.
I don’t know if the stuff that makes up the wall knows there is other water that wants to get through to fight a fire, but all of the pushing from the water stream is a clue for its molecules to try to move out of the way.
How soap convinces the stuff that makes up the wall to not want to be a wall anymore can go into a discussion of diplomacy.